I will have to deactivate this plugin until this is fixed.
The '@' char is required everywhere, now i can't even enter my e-mail adress because this dict quick search toolbar pops up when pressing ALT+Q.

@Follow Up answer
Sorry, i meant Alt Gr + Q. It happened on a Windows 7 Prof System while trying to comment to a Youtube comment.
To test it again, i reactivated the plugin and i think i now narrowed the problem down.
It seems to be, that my keyboard layout was accidently set to the English layout (EN) during that session (i have that windows language keyboard layout icon in the lower right corner) and i didn't noticed that.
When the layout is set to English on the software side in Win 7 pressing Alt Gr + Q will result in this pop-up of the dict search bar.
If i set it back to DE layout in the lower right corner, everything works fine again.
So probably my fault.
I don't know if its possible to make the plugin ignore the key combination of Alt Gr + Q if the layout is accidentally set to English layout but it would be a good thing in my opinion.
I will give the plugin now 5 stars.
Thanks for your answer.

I read your rant ;) Though I do not agree because I think Quantum and Photon are a huge improvements I certainly see that this (repeated) rewrite must have a lot(!) of work. I feel your pain...

As a Nightly user I am very happen with your add-on. Thank you. Especially the Ctrl+Alt click shortcuts are really good (once I found out about it ;).

Previously I always manually went to dict.cc. Now this is a great time saver.

best tranlation software I have found so far

The first option "translate phrases" isn't available, even not after reinstalling it more than one time.

Lusito, is there no direct translation between English and German possible anymore? There usually was one and on one picture about the add-on it is seen.

Otherwise okay, but on a Mac it's still only the second best option.

This is because of the interface forces an extra step upon the user: They have to pick which languages to translate with every single word.

This might make sense if the user wants to regularly translate from several languages. But this is really stupid in cases where the user has specified in the preferences only one language setting, like "DE to EN". Ignoring this the add-on still asks the user to click on "Translate to DE-EN" every time. If the uses specifies only one language pair, it would make sense for the add-on to provide instant translations without extra clicks.

On a Mac (I have no idea about PCs) the user can use the build in Dictionary function. With this the user can simply perform a single gesture, for example a three-finger-click (this can be customised to suit ones preferences), to bring up a translation for any word. Nothing extra is required. So at the moment that's the fastest and most user-friendly way to translate words on any web page.

I'm a big fan of using dict.cc, so I would love to see this add-on get better. But until this add-on achieves a similar ease of use to what OS X offers as a default, it simply isn't worth using if you're on a Mac.

Thank you so much to taking the effort and bring this excellent add-on back to Firefox! I was beginning to miss it badly...
(Hopefully you'll get the pocket panel working as well... ;-)

This is an extremely helpful tool. I can look up a word quickly and efficiently and still be assured of accuracy since it comes from dict.cc.

I like this updated version quite a bit. (Even though the others worked well, too.)

Thanks,
~frankiebluej