Clicks on overlay icon do nothing.
The Firefox extension overlay clicks are failing because of an uncaught type error in the background script. Firefox rejects declarativeNetRequest.updateDynamicRules because the condition object uses the Chrome-specific excludedDomains property instead of Firefox's supported variants.

I visit a lot of websites in different languages, and this makes things much easier. The translations read naturally, and I can understand pages without having to keep switching back and forth between tabs. Very handy for everyday browsing.

can and do count on this

If you want to play “Sorry, we couldn't translate your text. Please try again later,” pay a plan, use this slop, and you'll almost always win.
NEW! NEW! Now with the inability to login from the sidebar!

it manages, though it seems to rely on AI presets, which makes "AI hallucinations" easy. So for example if you tell it to translate a string which uses similar words to (for example) a well-known quote, it will just erroneously conclude you're paraphrasing the quote, then print out the quote verbatim, even if it's the completely wrong translation. Lately whenever it gets confused it defaults to some language called Hausa.
Always double-check with Google Translate, just in case.