This works very nicely, thanks a lot! The only thing missing in my view is (as in the Chrome equivalent) an extra option to press a trigger key to "Display pop-up when I select a word or phrase". Basically, I want the double-click to immediately translate a word and "CTRL+highlight the text" to translate an entire phrase. Would that be possible?

so usefull!

You're amazing super job. Thanks for this add ons

The best add-on for me which long time I was looking for. Thanks community. Keep it up-to-date.

Fixed the rating, absolutely phenomenal, very highly recommended

[EDIT] Originally had some issues in v1.0.5, but was able to get a bugfix merged and the developer is very responsive.

This addon is what I want exactly for a long time. Thank you.

This is really helpful and this tool is a must if you are looking for quick translations in the firefox browser. I do recommend!

Easy! Double-click word, get definition.

Finally I can ditch Chrome. Thank you for your service.