Rated 4 out of 5 stars

I have been using this add-on for years in Thunderbird, and I was happy with it. I have found it indispensable, for multi-lingual users, and there are many of us out there. I have no idea when it stopped working, and thought that there is probably a bug which will be fixed. It was not. So I tried other add-ons, and used a different one for a while, than that one disappeared, tried this one again... It was not until now, when I have found in a review by tunayx (https://addons.mozilla.org/en-US/thunderbird/addon/dictionary-switcher/reviews/667322/) that you need to get into the config and turn the automatic recognition on manually:

Options>Advanced>Config Editor set this as 'true'
extensions.dictionary-switcher.autodetect

I could not imagine that this need to be done manually - please warn users, as you will loose them otherwise. It would, of course, be better if it could be turned on from add-on options.

I also have a compatibility issue with my favourite add-on 'Thunderbird Conversations' - it would be great, if the autoswitching would work in the quick reply.

But it is a fantastic and very important add-on, once the user figures out how to turn it on. Keep up the good work!