This addon seems not to be updated in years. I would like to mention LibRedirect [1] which offers more front ends for more websites and seems more actively developed [2]
I also use libredirect but it has this annoying bug where the reddit redirect will randomly stop working and the only way to solve it is to completely uninstall the extension (not only disabling) then reinstall.
But I can’t stand anymore to be on Twitter or Medium so it is a must. I also use it for Youtube, stackoverflow.
I’m a bit confused by the current project because there are litteraly tenths of Youtube->invidious/alternative frontend and I don’t understand why this one is different.
One of the goals from https://github.com/mushroomlabs/fediverser is to mirror reddit discussions into different Lemmy instances. This coming week I'm planning to work on the part that lets you connect your reddit account to a respective Lemmy instance and migrate your posts. Would you like to try it out?
Well, for one, the addon you linked has not been updated for over 2 years. This doesn't speak to the substance of your question really, but ad-blocking is a whack-a-mole game. Resources need to be constantly updated to keep up with companies' efforts to thwart them.
It's always nice to see new efforts in this space.
[1] https://addons.mozilla.org/firefox/addon/libredirect
[2] https://github.com/libredirect/browser_extension