Hi rosawood, Sorry to hear you're having issues playing videos on PragerU. You could try and see if this chosen solution works for your situation by following the steps provided : [https://support.mozilla.org/en-US/questions/1206076 Firefox is not playing videos on websites.] You could also try and check to see if the videos play in Safe Mode. 1. Click the '3-bar' '''menu''' in your browser in the top right corner of your screen. 2. From the list, click '''Help''' 3. Click''' Restart with Add-ons Disabled... ''' 4. When prompted, choose '''Restart In Safe Mode''' If the above steps do not work, you could try clearing your cache. '''Warning '''"Clearing all cookies and site data stored by Firefox may sign you out of websites and remove offline web content. Clearing cache data will not affect your logins."''''' 1. Click the 3-bar '''menu''' in your browser in the top right corner of your screen. 2. Click '''Options''' 3. On the left-panel click '''Security & Privacy''' 4. Under '''Cookies & Site Data''', click '''Clear Data ''' See also: [[Troubleshoot Firefox issues using Safe Mode]] {link} [[Fix video and audio playback problems on Firefox for Windows]] {link}