The snap with Firefox 84 has the same problem. I tried Ubuntu Studio 20.04, that also uses XFCE and that worked fine and so do the Ubuntu 20.04, Ubuntu Mate 20.04 and Xubuntu 21.04 Dev.Ed.
However e.g Ubuntu 18.04 and Xubuntu 18.04 do have the same problem. To be a little more precise. If you select the YouTube video by clicking on its thumbnail, it has that strange behaviour, if you click in e.g. the middle of the progress bar, the same problem repeats itself. The buffer builds up in both cases to say 60 seconds, while the screen remain static on say that first frame and then empties itself in a few milliseconds and that repeats itself many many times :) However if you press the halt button in the left-down corner of the video and afterwards the play button, everything is working as expected. The same happens if you click in the middle of the screen twice as a start and stop action. It only starts correctly, if you start it manually. The automatic start fails and so does the auto repositioning by clicking in the progress bar. I hope this helps. There is probably some "timing issue" in the auto start, maybe forgetting that it should be displaying, because of a multi- threading/locking issue. In my experience this type of seemingly timing issues are often related to not locking shared data/buffers or locking it incorrectly. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1898656 Title: Firefox not playing YouTube videos in Virtualbox on Xubuntu Status in firefox package in Ubuntu: New Bug description: In Xubuntu Firefox does not play videos of e.g. YouTube or the Dutch TV Viewer. It works in all other Virtualbox VMs with e.g. Ubuntu 20.04, Ubuntu 16.04 or Windows 10 Pro. The problem is related to the buffering (stats for nerds). It build up the buffer and when the buffer reaches its value, it plays the content of the buffer in a few milli seconds. Afterwards it starts again with the same process. I have reinstalled firefox, but the problems remains (apt --reinstall install firefox) The problem is independent on the selection of the hw acceleration in the firefox preferences. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: firefox 81.0+build2-0ubuntu0.20.04.1 ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60 Uname: Linux 5.4.0-48-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bertadmin 1398 F.... pulseaudio /dev/snd/pcmC0D0p: bertadmin 1398 F...m pulseaudio /dev/snd/timer: bertadmin 1398 f.... pulseaudio BuildID: 20200917005511 CasperMD5CheckResult: skip Channel: Unavailable CurrentDesktop: XFCE Date: Mon Oct 5 23:12:41 2020 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2018-03-11 (940 days ago) InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180310) IpRoute: default via 192.168.1.1 dev enp0s3 proto dhcp metric 100 169.254.0.0/16 dev enp0s3 scope link metric 1000 192.168.1.0/24 dev enp0s3 proto kernel scope link src 192.168.1.111 metric 100 Locales: extensions.sqlite corrupt or missing PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:733 PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=81.0/20200917005511 (In use) RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to focal on 2020-03-04 (215 days ago) dmi.bios.date: 12/01/2006 dmi.bios.vendor: innotek GmbH dmi.bios.version: VirtualBox dmi.board.name: VirtualBox dmi.board.vendor: Oracle Corporation dmi.board.version: 1.2 dmi.chassis.type: 1 dmi.chassis.vendor: Oracle Corporation dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: dmi.product.family: Virtual Machine dmi.product.name: VirtualBox dmi.product.version: 1.2 dmi.sys.vendor: innotek GmbH To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1898656/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
