Comment 2 for bug 19158

Hmm. Not sure I have any good ideas, but here are some questions:

What window manager are you using - the default ?
Do you have any plugins installed ? Can you try without ?
Can you easily see if it does it with a fresh profile (ie, move your .mozilla
aside) ?
Which of the configuration/preferences have you changed ?
Are there any sites that do it more than others ?