Comment 3 for bug 63570

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Mateusz Drożdżyński (matid) wrote :

The package you should have installed is 'flashplugin-nonfree'. Please make sure it's there.

I also suggest trying to open the websites you've mentioned in the Safe Mode with all extensions disabled. You can open the browser in Safe Mode it by starting it with:
 firefox -safe-mode

Thanks in advance!