Firefox fullscreen video lags

1.

Adwcleaner- nothing found

2.

Malware Bytes- nothing found

3.

Avast- nothing found

4.

Firefox doesn't lag in !fullsreen

5.

Firefox no addons save mode doesn't help

6.

Chrome and IE fullscreen works
Youtube and others - so it's html5 video player problem I guess. Any ideas please?
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Fajer39Asked:
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☠ MASQ ☠Commented:
Does it improve if you disable hardware acceleration?
(right-click on video > Settings > 1st tab on left)
Uncheck and test playback
Fajer39Author Commented:
Well, youtube doesn't use flash, so it doesn't...
Fajer39Author Commented:
Solved - after removing Avast, all the browsing problems disappeared (chrome included). So leason learned. :-)

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Fajer39Author Commented:
self explanatory
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