Foxy Proxy on Mullvad Browser doesnt proxy at all about browser-extension

[erosman]

Mullvad Browser seems to have built-in VPN/TOR settings that might interfere with the proxy settings.

Have you enabled Private Browsing Permission?
Are you using patterns on single proxy mode?
What does the Firefox Network Settings show?

[NearestWater262]

Yes I enable Private Browsing permission.

No I did not use any patterns, just installed and went straight to adding a basic socks5 proxy with a title, host, and port.

Here is the network settings that are default in Mullvad browser below

[erosman]

From Network Settings, FoxyProxy is not controlling the proxy settings.

Is the FoxyProxy icon on the toolbar in colour or grey?

Also...

• Open FoxyProxy Options page
• Open Developer Tools (F12)
• Go to Console tab
• Paste the following

browser.proxy.settings.get({})
.then(console.log)
.catch(console.error)

• Enter

What does it say?
You can remove private data before posting in here.

[NearestWater262]

it's in colour

[erosman]

Above shows that FoxyProxy is handling the proxying but it is set to the system i.e. the mode is "Disable".
What happens when you change the mode via the toolbar popup?
Does the icon change?

[NearestWater262]

What happens when you change the mode via the toolbar popup?

what mode? what toolbar popup? please explain with a screenshot? Sorry, just confused and want to make sure I know exactly what you mean.

@erosman

[NearestWater262]

also, suddenly, this is appearing below but still is not proxying, still using my regular IP

[erosman]

what mode? what toolbar popup? please explain with a screenshot?

In FoxyProxy, user add. edit their proxies on the Options page.
Selecting which proxy to use, or disable proxy (i.e. the mode) is done via the toolbar icon popup.

[NearestWater262]

Above shows that FoxyProxy is handling the proxying but it is set to the system i.e. the mode is "Disable". What happens when you change the mode via the toolbar popup? Does the icon change?

hope this answers your question. maybe you can give Mullvad Browser a try for yourself

[erosman]

There seems to be an issue with browser identification and FoxyProxy sees Mullvand browser as Chrome which would break the functionality.
I will run some tests and get back to you.

[NearestWater262]

There seems to be an issue with browser identification and FoxyProxy sees Mullvand browser as Chrome which would break the functionality. I will run some tests and get back to you.

Hmm.. very weird indeed. Thank you for looking into this. I am use 7.5.1 which works fine, maybe something in that version's code will help you.

[erosman]

FoxyProxy v7.5.1 was a Firefox only version. FoxyProxy v8+ has a unified code for both Firefox & Chrome.

See also:
Mullvad Browser FoxyProxy not working

[NearestWater262]

this isn't mullvad browser issue because older version of Foxy Proxy works correctly

any update?

[erosman]

Can the browser be run without installation (like Nightly)?
I downloaded it but didn't find any instruction on running it WITHOUT installing it.

mullvad-browser-linux-x86_64-13.5.1.tar.xz
Ubuntu 24.04

[NearestWater262]

@erosman yes, you can extract the tar and just execute the binary like with tor browser bundle, you can execute the start-mullvad-browser.desktop. just be sure you mark it executable with sudo chmod +x start-mullvad-browser.desktop

[erosman]

@erosman yes, you can extract the tar and just execute the binary like with tor browser bundle, you can execute the start-mullvad-browser.desktop. just be sure you mark it executable with sudo chmod +x start-mullvad-browser.desktop

It doesn't run for me.

[NearestWater262]

@erosman not sure what to say without more info about the errors..
maybe try running the script under Browser/start-mullvad-browser

[NearestWater262]

you can also get it on Flathub, if you have Flatpak. Very easy to uninstall when you are done with it.

[erosman]

I got it running with the help from Starting the Mullvad Browser.

Sadly, it wont allow unpacked or unsigned extension installation.

However, I found the problem which is the browser detection.

In fact, the issue has already been fixed in v8.10 subsequent to another issue in Proxy by patterns not working if firefox users change their userAgent to another platform.

Please wait for v8.10 release or for now try using v7.5.1 from https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/versions/ .

[NearestWater262]

Sadly, it wont allow unpacked or unsigned extension installation.

there is a config to allow them, xpinstall.signatures.required change to false

might have to change xpinstall.whitelist.required to false as well

However, I found the problem which is the browser detection.

In fact, the issue has already been fixed in v8.10 subsequent to another issue in Proxy by patterns not working if firefox users change their userAgent to another platform.

Please wait for v8.10 release or for now try using v7.5.1 from https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/versions/ .

okay, awesome! Is there an estimation of when the 8.10 release is?

[erosman]

Is there an estimation of when the 8.10 release is?

I will work on preparing a release as soon as possible.