EDIT : the reader fail on some websites with this error : "Sorry, we could not find any text on this page."
This happened on that website and some others :

https://www.gurumed.org/2021/02/25/il-y-a-quelques-messages-cachs-dans-la-mission-martienne-de-lastromobile-perseverance/

It works if I select the text before hand tho, is it the intended behavior ?
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Finally, I no longer have to use Edge to enjoy the immersive reader ! I'm very grateful for that.

Suggestion : atm it's a bit cumbersome to access the reader tool. Could you do something like what the Text To Speech (TTS) addon does, i.e :

Select any desired text. A play icon appears, click on it to start the voice reading.

Or maybe do what Edge does :
Select the text, then right click and click on "read aloud" in the context menu.

Anyway, thanks again for this addon, I think this will be useful to many.