alexadam / save-as-ebook

Save a web page/selection as an eBook (.epub format) - a Chrome/Firefox/Opera Web Extension

save-as-ebook

Save a web page/selection as an eBook (.epub format) - a Chrome/Firefox/Opera Web Extension

How to install it

From Chrome Web Store

or manually (tested on v. 52.0.2743.116)

1. Navigate to chrome://extensions/
2. Load unpacked extension ...
3. Select the extension's directory

From Firefox Add-ons

or manually (tested on v. 50.0a2)

1. Navigate to about:debugging
2. Load temporary add-on ...
3. Select the extension's directory

Opera (tested on v. 39.0.2256.48)

1. Navigate to opera:extensions
2. Load unpacked extension ...
3. Select the extension's directory

Convert .epub to .mobi

sudo apt-get install calibre
ebook-convert "book.epub" "book.mobi"

Default Keyboard Shortcuts

NOTE These shortcuts are not fixed and the browser will assign a different shortcut if the default one is taken

Shortcut	Description
Alt + Shift + 1	Save current page as eBook
Alt + Shift + 2	Save current selection as eBook
Alt + Shift + 3	Add current page as chapter
Alt + Shift + 4	Add current selection as chapter

How to change the default Shortcuts

in Chrome:

1. Navigate to chrome://extensions/
2. Scroll down
3. Click on Keyboard shortcuts

Added in 1.4.2

• Added MIME type to the generated .epub file

Added in 1.4.1

• Remove unnecessary permissions
• Detect image type if the URL doesn't have a file extension (jpg, gif, png)
• Reset the Busy indicator on errors
• Remove hidden elements when style is not included
• Replace iframes with divs

Added in 1.4

• Smaller ebook file size
• Fix for #37 - custom styles not applied
• Fix for #36 - br tag missing from pre blocks
• Fix for #31 - hanging in Busy state
• Other misc bug fixes

Added in v1.3.4

• Fix for MathML - the rendered expression is too large (Issue #26)
• Add translation in Russian (thanks to @ Emil Khalikov) & Brazilian Portuguese (thanks to @welksonramos)

Added in v1.3

• Keyboard shortcuts
• Simplified tool bar menu
• Misc bug fixes

Added in v1.2.2

• fixed & & issue in title; Issue # 10

Added in v1.2.1

• support for hr/br html tags

Added in v1.2

• BETA: Support for CSS
• BETA: Create / edit custom Styles
• No errors from EPUB Validator (http://validator.idpf.org/) + this should fix the Google Play upload issue

Added in v1.1

• Chapter Editor: option to save changes
• Chapter Editor: option to remove all chapters
• persist Chapter Editor changes & chapters after generating an eBook or after a browser restart

To-Do

• make the Custom Style Editor more user friendly
• support backup / restore for Custom Styles
• DONE fix all 'epubcheck' errors (https://github.com/IDPF/epubcheck)
• clean & optimize code
• create tests
• support other formats (mobi, pdf etc.)
• show confirmations (ui/ux)
• display errors (ui/ux)
• DONE support custom style
• add 'remove from ebook' right click menu action

Run Tests (Work in progress...)

cd tests
yarn install  # install puppeteer
node test/index.js  # should start a chrome instance with Save as eBook loaded

# it will generate and save the ebook in ./tmp-downloads

.... 

Credits

• http://ebooks.stackexchange.com/questions/1183/what-is-the-minimum-required-content-for-a-valid-epub
• https://github.com/blowsie/Pure-JavaScript-HTML5-Parser
• https://stuk.github.io/jszip/
• http://johnny.github.io/jquery-sortable/
• https://github.com/eligrey/FileSaver.js/
• https://www.iconfinder.com/icons/753890/book_books_education_library_study_icon#size=128
• Thanks to pumpk0n and Francois Bocquet for helping me with the French translation

save-as-ebook's Issues

Horrible Result

Hello,

I tried to save a single page (this article) using 'Save Page' command and the result was horrible, I would say that the generated EPUB file is unusable.

Screens:

For me such EPUB files are unreadable.

I am using Save as eBook version 1.3.5 with Cent Browser (Chromium-based) version 4.1.7.182 on Windows 8.

I hope that this extension is still in development and and new releases would fix such issues.

Regards

br tag disappears from inside pre tags

I'm trying to convert the Wordpress Plugin Handbook in epub.

I'm noticing several issues, I'm currently investigating on the causes.

I set a custom style with the following rules:

#wpadminbar {
    display:none;
}
#wporg-header {
    display:none;
}
header {
    display:none;
}
#secondary {
    display:none;
}
#wporg-footer {
    display:none;
}
.breadcrumbs {
    display:none;
}
.nav-links {
    display:none;
}
.table-of-contents {
    display:none;
}
.toc-jump {
    display:none;
}
#content {
    max-width:100%!important;
}
.screen-reader-text {
    display:none;
}

But if I convert this page:

https://developer.wordpress.org/plugins/plugin-basics/determining-plugin-and-content-directories/

the br inside the pre tags are removed showing all the content in the same line...

request to get it work for thunderbird

appreciate very much if you could get a thunderbird extension please

Feature Request: extract H1,H2,etc. tags as chapters

I'd like to be able to convert a page or selection as multiple chapters based on the location of H1, H2, etc tags, using the plain text between the opening and closing of a tag as the chapter name.

As an example, I just converted the Lua 5.3 Reference Manual to an eBook. It was a tedious process to manually select each chapter and capture it individually, then go back to edit the chapters to correct their titles. It would have been so much easier to just capture the page and have this extension be able to generate the chapters from the H1 and H2 tags on the captured page.

Unexpected behavior on custom stylesheet.

The attributes writing-mode and -epub-writing-mode are filtered out by extractHtml.js in supportedCss. Adding them to the array lets them through to the combined css. However, there is still an unexpected behavior.

Adding the following css snippet to the custom styles:
html { -epub-writing-mode: vertical-rl; writing-mode: vertical-rl; }
The resulting css in the epub is:
.vj0 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:16px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .wY1 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:700 32px / 51.2px "Times New Roman";line-height:51.2px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .zV2 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:700 24px / 38.4px "Times New Roman";line-height:38.4px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .mv349 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:700 20px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .RM354 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:700 18px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .Jk357 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:16px / 16px "Times New Roman";line-height:16px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .lL360 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:8px / 4px "Times New Roman";line-height:4px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .ow8104 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:13.3333px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .xU24984 {background-color:rgba(0, 0, 0, 0);border:1px inset rgb(0, 0, 0);color:rgb(0, 0, 0);font:16px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .Hj24998 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 238);color:rgb(0, 0, 238);font:16px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:start;writing-mode:vertical-rl;} .Zr25006 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:16px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:40px 0px 0px;text-align:start;writing-mode:vertical-rl;} .QM25007 {background-color:rgba(0, 0, 0, 0);border:0px none rgb(0, 0, 0);color:rgb(0, 0, 0);font:16px / 25.6px "Times New Roman";line-height:25.6px;list-style:outside none disc;padding:0px;text-align:left;writing-mode:vertical-rl;}

The -epub-writing-mode somehow was still filtered out. This renders the whole book wrong, somehow collapsing a 56 chapters book into a 4 pages book.
Manually adding back the -epub-writing-mode snippet to the top of that generated css fixes the book rendering.
html { -epub-writing-mode: vertical-rl; } ...

In-page links (#anchor-only) get broken

Saver prepends base URL to all relative URLs, even to in-page ones, i. e. a link like <a href="#ref1"> becomes <a href="https://example.org/article#ref1">.

This seems to be easily fixable for single-page epubs, yet it would be very nice if cross-page links between chapters saved in a single epub from different pages would be uniquified and converted to relatives too.

Chapter Queue should not auto-clear, to give user opportunity to make edits.

Today I wasted an hour trying to make a large ePub from 25+ favourite Medium.com articles on UX design.
Once I was done adding chapters I rendered the ePub.

It downloaded the hefty 114Mb ePub and cleared the Chapter Queue, yet the generated ePub wouldn't successfully open, and triggered a "corrupt!" warning in iBooks.
I tried converting it to a PDF with online tools but they all say the filesize is too big.

To improve the overal experience, consider adding Projects/sessions the user can come back to, save mid-session, or edit/add content to at later time.
Alternatively it would also be an improvement if the "project" would at least get saved locally, so that a refresh (accidental, forced or intentional) won't mean losing your progress.

Web page not generating good epub

The following web page would generate "gibberish" epub:
http://ned.ipac.caltech.edu/level5/March01/Carroll3/Carroll3.html

It is worth noting that the other pages don't have this problem.
FYI: the index/content page is here:
http://ned.ipac.caltech.edu/level5/March01/Carroll3/Carroll_contents.html

Feature Request: Add all tabs as Chapters

More often than not I use save-as-ebook to capture a story that has multiple chapters. So it would be awesome if this feature is added.

Handle special characters in title/text

The add-on doesn't handle special characters properly. I was testing on a page whose title contains '&' character which was not escaped/converted. Therefore, generated xml files (content.opf, toc.ncx etc.) have become non-persible. Tested on Firefox 55 with official add-on.

Page annotation/editing

A complete editor would be useful but probably very time consuming to construct. Integration with an editor like Sigil (https://github.com/Sigil-Ebook/Sigil) could be problematic.

In lieu of these, an option for page annotation would be handy. This would simply be a text box where arbitrary text could be added when a page was captured. This would allow notes to be included and possibly edited later using an ebook editor. It could be included part of the "Add an option to include extra info like the URL of a page" issue solution. A CSS style would be useful so the text could be made to stand out when displayed. This annotation would likely be placed at the start of the document but a header and footer version might be useful or a header/footer designation for a single entry.

Superb Extension! -

Superb extension -- thankyou very much.
To access my chapters I needed to login (proxy). Now all the embedded links (there are 100s) have the proxy rather than link to the correct ebook page/section. Is this easy to fix? e.g. footnotes, author index, subject index, references etc etc..

Other than that, the EPUB is a brilliant result for my 16 chapters, 5 appendix.

This is the 5th tool I have tried and only one that grabbed ALL the content.
Done successfully

• Links are embeded and working (internal (e.g. links to footnotes, links to other chapters) and links to external references) -- though i had to relogin to navigate as it has the proxy url is included in the link
• Images were grabbed successfully
• Fully working TOC
• Page numbers showing in ibooks

[Environment: Chrome Extension on Cataliana]
[Extension settings used: selection, CSS settings checkmark on)

Workflow
1 Opened each chapter into a tab, then for each tab, Selected content on page
2 Using "Save as ebook" Extension, save each "selection" of page as chapter
3 edit chapters, reviewed to make sure none missing. Had missed chapter 4. so re did it (took a bit for the chapter I missed to appear under edit chapter. It appeared after I made sure all tabs that were showing edit chapter were closed.
4 added Chapter Numbers as this was not on source to listing of chapters
5 generate ebook

Please add option to not add "(Links to an external site)" to links

It's too long. I would prefer to just have the regular underline, or whatever is the actual style. It would also be good if there was an option to not include the links in the epub at all.

Support defining title, author and cover

Saving several different pages with "Save Page" on some sites results in the EPUB files with identical meaningless titles, so I have to edit metadata manually by defining the correct title, adding the author and cover. Only after that can I add the EPUB files to my library. Therefore, the suggestion is to add the ability to define the following metadata before/on saving:

• title
• author
• cover image

Doesn't fix URLs to say a list of illustrations

And yet it mangles them anyway by removing the "1201841h.html" for:
http://gutenberg.net.au/ebooks12/1201841h.html
Hmmm!?

This is a good text site for ebooks that are only available as web pages.

Kindest Regards.

Can't save when in Reader View on Firefox

I'm not able to save a page or a selection when i'm in Reader View on Firefox.

OS : Ubuntu 16.04.2
Firefox : 53.0.3 (64bits)
Save As eBook : 1.1

Feature request - button to change page direction of ebook

Would it be possible to add a button to change the page direction?
This is useful for Japanese novels and books, where the text is normally read vertically right to left, with pages being turned from right to left.

This requires adding a parameter to the spine tag in contents.opf (around line 163 of saveEbook.js)

The default spine is defined as:
'<spine toc="ncx">'

A right-to-left spine is defined as:
'<spine toc="ncx" page-progression-direction="rtl">'

I have attempted implementing a button for the functionality but ended up breaking the locally unpacked extension for Chrome.

when to support export mobi

thanks a lot.And i have another question that the table in the context can not been seen(i mean the cell not the content)

and it should be:

and can this plugin support to convert .md to .epub?

thanks again

Firefox Add-on doesn't finish installing

No idea what the problem is, but just to let you know I've tried to install as a Firefox add-on a number of times without success.

Clicking 'Add to Firefox' on https://addons.mozilla.org/en-US/firefox/addon/saveasebook/ opens a dialogue that shows it downloads fully very quickly but doesn't seem to install.

On 'about:addons' it shows as 'Downloading' but doesn't complete and can't be cancelled without closing the browser completely.

The manual install works fine.

(Really useful add-on - thanks!)

Add an option to include extra info like the URL of a page

It would be useful to have an option to include the URL of the page being captured in the epub and possibly the table of contents for multiple page documents. This could be a toggle per page with a global default. This is very handy tracking where content was obtained and it is useful when doing research where attribution or linking to a source is necessary.

The URL would be included in the page above or below the title.

Additional items that might included are:

• Date when the page was captured
• Name/ID of the person capturing the page (would be a configuration field)
• Browser/save-as-book version used to capture the page

Request for the Ability to add links as chapters

Thanks for the great extension.

It would be really helpful to be able to select a set of links from a page and add them all as chapters. I read a lot of Fan-Fiction and it would make life easyier when adding 20 or 30 pages to an ebook if I could simply select the all the chapter links and add them as chapters.

Saving a page, "Save as a eBook" hangs in BUSY state (and icon)

Trying to saving https://www.wired.it/attualita/tech/2019/03/19/singapore-citta-intelligente/
Extension freezes and icon show Busy status even after browser restart.

How can I clean up state?

Thanks in advance

Include styles

this is just a tip, for future releases.

Need more control over the capture

Save-as-ebook is good at capturing everything in the page indiscriminately, which is useful because capturing everything is better than not capturing the needed part of the page. But this also makes it necessary to clean the generated epub of the unnecessary details afterwards.

Adding the ability to apply regular expression replacements on the capture, based on some site rules would significantly if not completely reduce the need to separately clean the epub afterwards.

Also as I mentioned before it would also help editing the epub if the names of the files inside the created epub are human readable.

Latex formulas are huge

Latex formulas result in giant height and width images in the output epub. (For instance try to convert this equation). When I convert with dotepub they are slightly large but better.

May I help you to translate extension in French

Your extension is awesome for public schools and teacher. May I help you to translate it in french for free ? I'm in charge of prospective in french ministry of education. Regards.

Handle consecutive line break (<br /> tag) as paragraphs

Some pages use double line breaks (<br>, <br />) instead of paragraphs. During conversion, these tags are trimmed (I guess), which causes the whole book/chapter to be a single paragraph.

HTML markup in output epub file

Hello,
in latest Firefox (archlinux, clean profile, 59.0.1, the only extension is "Save as eBook"), one website is saved as HTML markup. This is
https://www.polskieradio.pl/39/156/Artykul/1068055,Stefan-Kisielewski-muzyk-polityk-felietonista
It doesn't matter if I save the full page or a selection of it.
Other websites I tested work fine.

Many, many thanks for this wonderful extension!

Save as eBook removed from Firefox store

Hello,

Do you know that Save as eBook was removed from Firefox Add-ons. If you are aware of that do you know why Mozilla removed your extension from its store?

Regards

Can not save image

URL: https://www.rubyraptor.org/how-we-made-raptor-up-to-4x-faster-than-unicorn-and-up-to-2x-faster-than-puma-torquebox/

Capturing unneeded elements

This plugin usually captures some unneeded elements for me so far. For example it works terrible with scribblehub. If there is even one comment in the comment section the main content is completely ignored and only the comments are captured. When that happens epub starts with the string "Error: Parse Error:".

Even when the main content is captured there are some unneeded elements capture both before and after the necessary content. It would be nice if we can specify which elements are going to be captured or not, preferably by using Xpath expression of the needed elements.

Have site matching configurations for Styles and Rules

Currently there is one style for everything. Changing it manually can be a pain when switching between sites and most will have a desired configuration.

I would be useful to have a way to select the configuration for a specific website. Pattern match is one way but would be confusing to most users. A simple option in the pulldown menu to switch from the default to a specific configuration would be useful. At this point it would be for the Style but adding rules or other features would make the number of settings more complex but more useful in the long run.

Check out the issue "Rules for captured content" regarding the reference to Rules in this issue.

Custom styles randomically neglected

Ok, another one:

page (not only this one...):
https://developer.wordpress.org/plugins/plugin-basics/determining-plugin-and-content-directories/

custom style:

#wpadminbar {
    display:none;
}
#wporg-header {
    display:none;
}
header {
    display:none;
}
#secondary {
    display:none;
}
#wporg-footer {
    display:none;
}
.breadcrumbs {
    display:none;
}
.nav-links {
    display:none;
}
.table-of-contents {
    display:none;
}
.toc-jump {
    display:none;
}
#content {
    max-width:100%!important;
}
.screen-reader-text {
    display:none;
}

In the epub at random I see some of the html classes/ids that I set to display:none (#wporg-header, #wporg-footer).

I've observed that in the HTML code of the preview shown by the browser (with alt+shift+1 for instance) the classes can be hidden or absent at all, in the former case the epub will show the aforementioned issue, in the latter the epub will be correctly displayed.

I've experienced this issue both with the latest release and with the master branch.

Set shortcuts for actions

Hi,

Love your addon. I sometimes use it for 20+ tabs in a row and it would be really helpful if i could set a keyboard shortcut for "Add Page as Chapter", but I think it might be useful for every action.

Table borders are not present in the ePub

Similar to #50, borders are not present in the tables (and I suppose in every other place).

Save the following page:

https://dev.mysql.com/doc/refman/8.0/en/innodb-locking.html

with the custom CSS rules:

header,
#docs-sidebar-toc,
#docs-version-nav,
#docs-breadcrumbs,
#docs-in-page-nav-container,
footer
{
  display: none!important;
}

.has-toc {
  margin-left: 0!important;
  border-left: none!important;
}

and check the borders of the first table.
I'm using Firefox on Windows, I haven't tested on Chrome.
The reason is the "border" property: in Firefox it's an empty string and when you grab its content in

save-as-ebook/web-extension/extractHtml.js

Line 329 in 12a4cbb

let cssValue = $pre.css(cssTagName);

you get nothing.

I've locally fixed the issue by changing the content of the supportedCss array in

save-as-ebook/web-extension/extractHtml.js

Line 38 in 12a4cbb

var supportedCss = [

const supportedCss = [
    'background-color',
    'border-top-width',
    'border-top-style',
    'border-top-color',
    'border-bottom-width',
    'border-bottom-style',
    'border-bottom-color',
    'border-left-width',
    'border-left-style',
    'border-left-color',
    'border-right-width',
    'border-right-style',
    'border-right-color',
    'border-collapse',
    'color',
    'font',
    'line-height',
    'list-style',
    'padding',
    'text-align',
    'display'
];

Rationale for permissions in Firefox

First of all, great project! I'd love to use the Firefox extension, but I couldn't get over the number (and magnitude) of permissions requested. Can see why some of these are necessary, but still, "access your data for all websites" seems scary.

I'm not familiar with building browser extensions, so I apologize in advance. Are all these permissions necessary?

Ruby rb tags ignored by extractHtml.js

If you try to convert a Japanese webpage containing ruby tags, the rb tags are ignored by the parser.

<ruby><rb>私</rb><rp>（</rp><rt>わたくし</rt><rp>）</rp></ruby>
gets saved as
<ruby class="MG357"><rt class="WF360">わたくし</rt></ruby>
As a result, you have the ruby furigana but are missing the kanji in the epub file.
Expected output:
私（わたくし）
Real output:
わたくし

This is caused by line 15 of extractHtml.js:
'dfn', 'em', 'i', 'img', 'kbd', 'mark', 'q', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'small', 'span',

Adding the rb tag solves the issue:
'dfn', 'em', 'i', 'img', 'kbd', 'mark', 'q', 'rb', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'small', 'span',

Use the browsers 'reading mode' as input

The goal of feature 'Include custom style' is to save only the relevant content without much hassle.
Sadly, it works only on predefined sites / is work to configure for each new site.
The solution: Use the browsers 'reading mode' output instead.

syntax highlighted code rendering is messed up

Please see the comparison between the HTML rendering of the code and its epub version obtained using save-as-ebook. The epub was opened using iBook.

Fails on pages loaded before the extension was installed

This is probably an edge case but I had a few pages opened in tabs, then added the extension.

It fails with no obvious message in the UI but this in the console:

Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist.

I needed to reload the pages before it worked. I don't know if you can code around this but maybe you can document it?

Parse error - o:p tag I think

I tried to convert a web page and got parse error. I added a html validator to check the web site and that suggested that the problem might be <o:p></o:p> tags. These are not standard tags but are added by MS word (typical!). I saved the web page and stripped <o:p></o:p> and then tried again with the local file. This time there was no parse error. Hence it looks like the problem is MS, as usual. Perhaps the fix would be to ignore unknown tags rather than throwing an error.

Automatically apply 'Custom Style' for matching URL

Thanks to the 'Custom Style' feature, I can export just the portion of a page I need. However, it is not applied automatically and I have to click on 'Apply' every time for each page. This is really inconvenient and tedious when I'm exporting multiple pages (as chapters). I think custom styles should be applied by default, at least for pages that match the regex.
Alternatively, adding a check box similar to 'Include Style' should do the trick.

Some minor grievances.

1. When the same image is repeated several times in the webpage this plugin downloads&adds the image each time as a different image (saves it under a different name). It would be more elegant&efficient if it only downloaded the same image once!

2. Empty style sheets should be deleted!

3. Also you should change the way the files are renamed inside the epub. It's best if you keep these names independent from the source files. Something like,
   (a constant for given file type + index value).extension
   would look better.

Thanks for the amazing plugin. I have plenty of uses with it.

Some of Save as Ebook's epubs are incompatible with Iriver Story Hd

For example, an epub generated from this page only gets the header and the last page:

http://regiment.ru/Lib/C/172.htm

Also the header and the text on the last page stretch off the right side of the screen.

Running through Calibre, and converting to mobi, the language support issues leave it unreadable on the Kindle 2, but show much more text there.

Running through Calibre, converting to mobi, and coverting back to epub gives 4 pages on the Story Hd, still missing most of the text, and still stretching off the right side.

where can I download the plugin?

All saved EPUB have identical identifier

The identifier element in the OEBPS/content.opf file of saved EPUB files has identical isbn value:

<dc:identifier id="db-id">isbn</dc:identifier>

So, adding a newly saved EPUB file to my foliate library replaces the old one.
For the time being, to work around the issue, I have to generate UUID manually and use it instead of isbn for every file, which I would like to avoid.

replacing iframes with divs - issue concerning inline styles

In

save-as-ebook/web-extension/extractHtml.js

Line 120 in 12a4cbb

function extractIFrames() {

you're converting iframes to divs. The problem is, if an iframe has a style node, you're applying this style to the whole page.

break and horizontal rule

This extension strips out non-compliant tags such as <br> and <hr>, but it would be far superior if instead of doing that it would convert them to <br/> and <hr/> since those work just fine.

Rules for captured content

Check out GrabMyBooks rules and rule editor. It essentially does a selection based on rules. The interactive rule creation is impressive.

display block missing in some classes

If I convert the following url to a epub (save page):

https://overreacted.io/making-setinterval-declarative-with-react-hooks/

with the following custom css rules:

header h3,
.react-toggle,
main article header p,
footer,
aside
{display: none!important;}

body div div div div
{
  max-width: 90%!important;
} 

the display:block in class .gatsby-highlight-code-line is not present in the epub. leading to issues in visualization (as example please notice the first code box when "Your custom logic here" is written).

I'm using Firefox 90.0.2 on Windows.