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Cant watch videos online, facebook-yahoo are weird

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Cant watch videos on youtube or online movies anywhere else, facebook-yahoo are weird with no pics-vids its just letters placed one under another..!!! I was deleting temporary files with a proggram called slimcleaner and then this happened...for some reason explorer and google chrome are working just fine but i prefer firefox...!!! i downloaded the latest flashplayer version(wich i already had) and checked the javascript (it was ok) but nothing..

Cant watch videos on youtube or online movies anywhere else, facebook-yahoo are weird with no pics-vids its just letters placed one under another..!!! I was deleting temporary files with a proggram called slimcleaner and then this happened...for some reason explorer and google chrome are working just fine but i prefer firefox...!!! i downloaded the latest flashplayer version(wich i already had) and checked the javascript (it was ok) but nothing..

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Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See: