Preferences -> Advanced -> Un-check "Always use the cursor keys to navigate
within pages"
Fixed it for me..
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gray/black flashing bars on left of screen while on facebook.
https://bugs.launchpad.net/bugs/515035
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Bugs, which is
At least in my case, the problem is the giant flashing text cursor as described
in this bug:
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/612261
Clicking on an area with smaller text will make the cursor smaller and not so
annoying.
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gray/black flashing bars on left of screen wh