There's a Firefox extension I really like

https://simple-translate.sienori.com/

It allows you to translated selected text instead of having to fuck up an entire web page to translate one sentence.

A few months ago, it and one other plugin just… stopped working, on my Windows machine only, similar errors.

https://github.com/sienori/simple-translate/issues/562
https://github.com/gurumukhi/youtube-screenshot/issues/65

They still don't work, and neither extension dev can help me. I don't know where to begin debugging this. The extension continues to work on my Linux box.