Scrolling freezes after installing FF11, only manually dragging scrollbars keeps working.
While reading a page and scrolling normally, scrolling (almost) completely freezes. Then, the scrolling only works by klicking on the scrollbar and manually dragging it.
Klicking next to the scrollbar for page up / down has no effect. Scrolling via two-finger-guesture on trackpad has no effect. Scrolling with arrow-keys has no effect.
After the Scrollbar was manually dragged, scrolling using any of the other means mentioned works again.
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Well, this is probably caused by one of your extensions, or a corrupt Firefox profile. Let's try the easiest first ;)
Try to start Firefox up in Safe Mode, and let's see if you get the error still. If t still happens, we will know we need to dig a bit further. If it doesn't happen anymore, we can go through and narrow down what specific extension is causing the problem.
If it works in Safe Mode, then start Firefox back up in Normal mode. Disable all your addons (read the Disabling Extensions portion of this article). Then, re-enable them one by one, testing after each one. If it stops working after you enable one, then we know what the culprit is.
As I said, that is the most likely, but give it a try, if it that doesn't work we can do some more steps.
You can also try to disable hardware acceleration (it is disabled in Safe mode).
- Firefox > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"