Created attachment 8776405 [details] Screen shot for about:addons. According to about:addons I have three plugins installed: OpenH264 always activated, Flash ask to activate, and iTunes disabled. Visiting https://www.mozilla.org/en-US/plugincheck/ says: No plugins were found. If you believe this is an error, please file a bug and let us know. The plugin check has worked in the past. Using Nightly on Ubuntu. See attached screen shots.