Best tool. I am the guy who made the post on r/firefox Subreddit mentioning your add-on. It has over 350 upvotes now means people truly find your work amazing. However, a dude came in and posted that he reported your add-on for violating Firefox's policy. He wrote:
"It's good that you found another fugitive! I will immediately send a request to Mozilla to remove it for violating the policy: Add-ons must be self-contained and not load remote code for execution.
The fact is that Firefox prohibits any inline translator like Chrome. You can read about it here: https://www.jeremiahlee.com/posts/page-translator-is-dead/
And here: https://bugzilla.mozilla.org/show_bug.cgi?id=1589974"
This is his reddit profile: https://old.reddit.com/user/patrocl
From his comments so far, I guess he had made a similar add-on in the past which got removed from add-on store for supposedly violating some weird Firefox rule.. I think your add-on is in danger now. :(

Great extension and translates in page! As good as chrome translation.

thank! Please add hotkeys to translate and display the original page! Since I use the browser exclusively from the keyboard (I use it "vimium" extension), it is inconvenient to grab the mouse every time to press the "translate" button.

do sada najbolji

Gracias a esta extencion me quedo mas en firefox Gracias (Filipe Ps)

One of the best translation addons for Firefox.

It's very nice

Great work! It is even better than Google Chrome translator