I suggest to delete cookies and cache. It helped me.
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https://bugs.launchpad.net/bugs/1405874
Title:
firefox plugin-container is using too many CPU cycles
To manage notifications
Is there any browser available on Ubuntu which does not have this issue?
I experienced this with Chrome and tried Firefox, only to find out it's
just as bad (FF 51.01 64bit on Ubuntu 16.04.2).
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16.04 64-bit & 51.0a2 (2016-10-04) (64-bit)
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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1405874
Title:
firefox plugin-container is using too many CPU cycles
To manage notifications about this
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: firefox (Ubuntu)
Status: New = Confirmed
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Title:
It affects me too. Kubuntu 14.04 Firefox 34
grep flash
ii anki2.0.31all flexible, intelligent flashcard program
ii flashplugin-installer 11.2.202.425ubuntu0.14.04.1amd64
Adobe Flash Player plugin installer
dpkg -l | grep vdpau
ii libvdpau1:amd64
