Or, you can edit the hosts file to remove specific entries that may be causing videos on certain sites to fail (see this thread for an example). If you use a hosts file, you can temporarily disable it by renaming it Xhosts. Remove specific entries in the hosts file (advanced users)
See Reset Firefox preferences to troubleshoot and fix problems.
Allow the website as an exception to the Block pop-up windows setting. Select the Privacy & Security panel and go to the Permissions section. Make sure that Firefox is set to Remember history. Select the Privacy & Security panel and go to the History section. Verify that cookies are enabled and that the site is not blocked in the Exceptions list. Select the Privacy & Security panel and go to the Cookies and Site Data section. Click the menu button and select Settings. 
In the Menu bar at the top of the screen, click Firefox and select Preferences. For more information, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems. If the video or audio plays when you disable all extensions, then one of your extensions was causing the problem. If the site works with ad-blocking disabled, you may want to add the site to your whitelist in your adblocker filter. Clear the cacheĭisable interfering extensions or ad-blocking softwareĪd-blocking software, such as anti-banner filters of your Internet Security program, or extensions, such as uBlock Origin or Adblock Plus, can prevent audio or video content from playing. Only versions OS X 10.11 and above are supported. Note: The current version of Google Widevine is no longer compatible with older Mac operating systems such as OS X 10.9 and 10.10.
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