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
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!