Well it seems like Download Navi has all the features I need/want in a download manager except for this (maybe there is more), is this something easy to implement?
I was originally thinking of making a feature request asking for an adblocker for the built-in browser but I don't think it would work as effectively as uBlock Origin does in Firefox.
Sometimes when downloading from certain pages plagued with ads is impossible to download what I'm trying to download because the page is infested with redirects that lead to malicious websites, I think using Firefox + uBlock as a browser could solve this, if it is possible to implement it.