It works great and I can't imagine browsing without it. Unfortunately has some bugs.

The only shortcut for showing translation is "Ctrl+Alt", but in settings is stated that "Alt", "Insert" or "T" are the ones. You should correct it.

It doesn't work on some pages and edit fields. Is that because of limitations or you excluded something? There shouldn't be any excludes to work properly everywhere.

While I could agree to exclude the google translate page, you should use the 'translate.google.' rule instead of 'translate.google.com', cuz everyone can be in a different region. For example I use 'translate.google.pl' and there it works while in 'translate.google.com' doesn't. I suggested that in previous version, but there I could at least change it manually.

I'm extremely happy my favourite extension became now Web-Extension. I only use 3 addons ( Google Translator, Foxy Gestures and Ublock Origin ) while 2 of these are Web-compatible. Only Ublock Origin is not yet.

By the way, I'm using Fx 55 beta 1 and Google Translator 0.54, but the bubble doesn't show up after I highlight a word. Currently in order to avoid this, I'm relying on an other combination ( Press Shift + Highlight ) to do the job. I'm pretty sure it will be fixed...

It's useful and has a very nice UI/UX.

Very good work.
There are two or more entries in context menu > "Translate page in Google Translate".
Thanks.