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Removing Malicious Facebook Apps
and look for the app that is doing it. Click the pencil icon to the left of the app, and select remove app.
Look for something called "Page Rage".
The second possibility is that you installed something on your computer that also installed something called "Yontoo Layers" that is causing the problem. This is an actual MALWARE program installed on your computer, so you will need to go to your control panel and then go to Add/Remove Programs and find "Yontoo Layers" and uninstall it. If you are running up-to-date anti-virus software, your computer would not have let it be installed in the first place. If you have trouble with it not letting you uninstall it, download this
and see if it can be uninstalled using that program.
Another possible reason is that you installed a browser extension that is doing it.
To learn how to remove a browser extension, read this:
Most likely it will be a browser extension called "Greasemonkey".