I use this add-on. It doesn’t automatically turn on for every website but you get to choose which domains it works for and which domains it doesn’t.
Firefox
A place to discuss the news and latest developments on the open-source browser Firefox
Technically, you can enable it anywhere by using Redirector to prepend about:reader?url=
to the URL, with a sort of white/blacklisting system using Regex. It may or may not be able to show a useful content summary, of course. There is a pretty accurate algorithm built into Firefox that evaluates if it does, and shows or hides the address bar button accordingly. Maybe an add-on can leech of the result of this algorithm?
i need this on mobile
Does it not work on mobile?
are there extensions on mobile FF?
Yes, but not all of them work
i dont even see an extensions on mobile
I'd love that too, wrote about it some time ago: https://jeena.net/notes/1373
Will check out this addon .