It supports both links and embeds and is available on firefox for android. List of sites is on github. I’m the main developer so you can ask questions.
4 points
No, both manifest v2 and v3, but in earlier versions add-ons had to be vetted by reviewers or manually added to their account collections by users, but from v121,all extensions marked by their devs as compatible are available to everyone https://blog.mozilla.org/addons/2023/11/28/open-extensions-on-firefox-for-android-debut-december-14-but-you-can-get-a-sneak-peek-today/
