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Don't install flash unless you really have to (it's full of security issues). Most sites (youtube and vimeo included) work out of the box on updated browsers using built-in HTML5 capabilities instead of flash.

Firstly make sure your system and browser are updated. If videos are still not working, then install audio/video codecs https://ask.fedoraproject.org/en/question/9111/sticky-what-plugins-do-i-need-to-install-to-watch-movies-and-listen-to-music/

Lastly, if videos are sill not working, you can try to refresh FF (make sure you read the article, as it describes what will be removed form your browser it the process) https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings