Firefox Support Forum

Firefox used to have a setting to open 1, 3 or all previous session tabs, now that option is gone and defaults to open all tabs. The problem didn't affect me until I made a full Win 8.1 64-bit reinstall, I overwrote the entire previous profile with about 950 tabs; I made sure that profile specific files weren't overwritten, I checked internally with Total Commander looking for the specific profile name in all files of the old profile; anyway, the new firefox with the old profile quickly killed any operational capability of my PC, not even the mouse or the keyboard lights would work, until many minutes later, then slowly I could move the mouse to the upper right corner for the [ X ] to kill firefox. While trying to uninstall Firefox uninstaller offered to "refresh" so I did, and here I am

Is there something in about:config I can modify? I really need that option back, is a royal PIA as Firefox is working now, and a very very stupid idea to remove such important option.

Plugins, add-ons have nothing to do, Can anyone let Mozilla know about this, they killed the Feedback option on the Browser.

I'm having a problem with a couple videos where the video and audio aren't in sync. For example, the video in the first screenshot is only 2:30, yet when I play it, it seems to partially mimic the video in the second screenshot; it "extends" to 2:41, and it plays the video from the second video. However, it plays the audio from the first video and the progress bar still only goes to 2:30, yet the video keeps playing for another 11 seconds without any audio until the video from the second video ends. Seeking forward causes the different recommendations to pop up as if the video had ended normally.

I am using a MSI laptop on Windows 10. I have restarted my computer, cleared my cookies and cache, and updated Firefox to the latest version. This problem persists with all of my extensions disabled, and when logged in or out of YouTube (no matter the account) or in incognito mode. At first, I thought it had something to do with the video and/or channel, since the other video with the same problem was also uploaded by AmericanDadVEVO. When I tried watching the video in the first screenshot on Microsoft Edge (which I barely use and have no extensions on), however, it worked normally.

Any help would be appreciated! I really do not want to switch to another browser.

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.