When I open a new tab and want to watch an HTLM video (mostly Youtube, not flash vidoes) on it, the sound does not work. When I restart the Windows Audio service as advised on this video https://www.youtube.com/watch?v=lAGK783bb-E the sound goes back to working on all open tabs, but won't work on new tabs. So I have sound working on some tabs and not on the new ones. I do not have this issue on Chrome. Solutions I tried and that did not work: - modify the register using https://ccm.net/forum/affich-19119-no-sound-from-web-browser - solutions given here https://support.mozilla.org/en-US/kb/what-to-do-if-firefox-wont-play-any-sounds - check the volume mixer - uninstall audio driver - restart in safe mode - refresh firefox. Thanks for your help, Bolb