Can't watch youtube videos in firefox browser

When I try to watch any youtube video in Firefox, I get a black square where the video is meant to be. I tried solutions in the areas of appropriate assistance without success that I can not find the firefox tool button to activate javascript. I also have the latest version of the shockwave player. How can I go about fixing this problem?

It is a problem caused by an add-on/extension installed. Recently, I helped another person to solve the same problem.

Launch FireFox in Mode safe mode, which disables all add-on/extensions & trying to watch the same videos again. Then select just each module individually again until the problem resurfaced surface to identify the add-on causing the problem.

See: questions to troubleshoot Firefox in Safe Mode

Tags: Firefox

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