Labomedia Plus

Since quite a long time, I'm not able to dowload video on vimeo with Firefox (of course when the author let you download it), when I click on the button "Téléchargement" (I'm on the french version), I got "Chargement…" but nothing happend in the window below the button. I'm on linux debian testing / Firefox 21.
It works fine with chromium v22 on the same OS

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