hello ffasi, while you're on that page, right-click on a blank spot, go to view page infos > permissions and change the setting for shockwave flash in the list back to what you want it to be.

Thank you very much! In all the instructions and support pages it was never explicitely said how to undo such setting!!

Note that you should also see a Lego block icon on the left end of the location bar if plugins are used that allow to inspect and modify the setting for the current tab. If you click the "Site Identity Button" (globe/padlock) on the location/address bar then you should also see an overview of plugin permissions that have been changed from the default.

This may warrant a separate topic But I will start by asking it here.

Where does Firefox store the list of sites that have permission exceptions?

Is the list viewable through one of the about: pages?