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Ok, I initialy posted that this didn't work, but I realized that it was because I had disabled the "ubuntu-firefox modifications 2.7". After enabling it, now its working fine, yay!

Это отзыв для предыдущей версии этого дополнения (1.0.5.1-signed). 

That's odd. Can you contact me directly please and I'll try to debug? mozilla@kaply.com