Random artifacts appear when changing tabs

For some time, I've been getting occasional (though seemingly more and more frequent) weird artifacts on my browser when going to another tab. As you can see (outlined with red circles for visibility), the address bar changes to the other tab but the contents don't and when i move my cursor on the screen, the elements from the correct tab do load when touched by the cursor but the site doesn't show as it should until I select yet another tab and then the correct one again. Here are the screenshots:
http://i.imgur.com/dJ3J9XL.png
http://i.imgur.com/NsqT8Le.png
My setup is Firefox 33.1 (though it happened for long enough that I think the previous versions were also affected), Windows 7 x64 Professional. I have hardware acceleration turned off, I also tried browsing in safe mode (with all add-ons turned off) but the same thing happens. What may be the problem?

Create a new profile as a test to check if your current profile is causing the problem.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
Try to disable OMTC and leave hardware acceleration in Firefox enabled.
*<b>about:config</b> page: layers.offmainthreadcomposition.enabled = false
*http://kb.mozillazine.org/about:config

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