Sounds like a Video Driver issue. I can do Full to standard Youtube with no audio or video losses. And this is W10x64 FCU FF58.0.2x64.

Thanks for your answer. My graphics card is an amd 480. The Video Driver is up to date. I've already tried reinstalling

Shiek said

Thanks for your answer. My graphics card is an amd 480. The Video Driver is up to date. I've already tried reinstalling

Reinstalling the GPU driver or FF?

Yes, both

Here is a video link:

https://youtu.be/Vr7kXak7PwU

Possibly it is the Beta you are running as shows version 59 here. I would suggest going back to the stable release till the issue is fixed. If you are not reporting these to bugzilla then there is no point in running a Beta or Alpha Release. If you have a bug, file a bug report. https://bugzilla.mozilla.org/ Bug Writing Guidelines : https://developer.mozilla.org/en-US/docs/Mozilla/QA/Bug_writing_guidelines

Please : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 58.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

Pkshadow said

Possibly it is the Beta you are running as shows version 59 here. I would suggest going back to the stable release till the issue is fixed. If you are not reporting these to bugzilla then there is no point in running a Beta or Alpha Release. If you have a bug, file a bug report. https://bugzilla.mozilla.org/ Bug Writing Guidelines : https://developer.mozilla.org/en-US/docs/Mozilla/QA/Bug_writing_guidelines Please : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 58.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

Thanks for your reply. Now I`m using the version 58.0.2. It seems that this video problem is solved. I still have a problem with that. As soon as I start a game on the side, I get exactly the same mistakes