(Suite) Puntuado con 4 de 5 estrellas

Correction : after new tests, i think that the problem comes from "DownloadHelper" (used for videos).

When i unactive it, all is fine but when i reactive it and try a video download with "DownloadHelper" the problems appear...Before Firefox v19.0, it worked perfectly... :/

Reported too to "DownloadHelper" page :

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