Рейтинг 5 из 5 звёзд

Work well with firefox 51.0.0

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Didn't work in my FireFox 34.

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It works with Firefox 26.0, also with Youtube Center. But there should be an on-off switch.

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it doesn't work in my firefox 25.0.1. scroll and video window goes out of view

Please feel free to contact me on Support E-Mail mentioned on extension's AMO page. I need to understand why it is not working for you.