Hi! I use Firefox on Ubuntu 20.04.3. I tried to speed up video on Sharepoint. Right click -> speed -> 2.0 and nothing happend. When I right click -> speed again, I saw that speed still 1.0. Then I went to google, found that Sharepoint allow speed up videos only in HTML5 player. Then I knew that to do that in Firefox I should disable Hardware acceleration, so I did it, but it didn't help. OpenH264 Video Codec provided by Cisco add-on is activate. Then I decided that's Ubuntu. I install ubuntu-restricted-extras, ffmpeg packages (to support h.264 video), restarted, but again that didn't work. youtube.com/html5 saying that everything fine.