As much as I like the look of some of the beautiful work on Unity, and
how well it runs at times, and the potential it has, I don't think it
should be up to the window manager to determine how the menus of
applications look. In all sincerity I believe there are too many
different options possible,
These bug reports maybe related and handy as well:
https://bugs.launchpad.net/ubuntu/+source/human-theme/+bug/293637
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/294972
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/89267
This info may be of some use, tracking this bug down (considering it may
have to do with javascript or browsers in general for the issue).
Javascript engine:
Firefox: SpiderMonkey (?)
Chrome: V8
Epiphany: Unable to say with any degree of certainty
Layout Engine:
Firefox: Gecko
Chrome: Webkit
It happens in other browsers such as Epiphany as well in Gnome Shell with the
Adobe Flash Plugin.
But also in firefox with moonlight 4 or gnash for example. While in Minitube
for example cpu usage remains quite a bit lower.
So, based on some info found, there might possible be a different
Similar bug filed here:
https://bugs.launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/225165
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https://bugs.launchpad.net/bugs/636475
Title:
Very high CPU used by Firefox
