Public bug reported: I initially posted this bug to the Firefox issue tracker here: https://bugzilla.mozilla.org/show_bug.cgi?id=1596397, but we determined it was specific to the Ubuntu package.
When I play the video in this JSFiddle: https://jsfiddle.net/ea9h3bg7/, there should be no audio. This is the behavior in the Firefox 70 build that you can get from Mozilla's website. However, with the Ubuntu build, audio is still heard. --- Ubuntu 19.10, Firefox that shipped with the distro, upgraded to 70.0.1 via the Ubuntu update manager. Firefox package version: firefox: Installed: 70.0.1+build1-0ubuntu0.19.10.1 Candidate: 70.0.1+build1-0ubuntu0.19.10.1 Version table: *** 70.0.1+build1-0ubuntu0.19.10.1 500 500 http://fr.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu eoan-security/main amd64 Packages 100 /var/lib/dpkg/status 69.0.3+build1-0ubuntu1 500 500 http://fr.archive.ubuntu.com/ubuntu eoan/main amd64 Packages ** Affects: firefox (Ubuntu) Importance: Undecided Status: New -- 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/1852645 Title: WebAudio API does not behave as expected (Cannot mute videos) Status in firefox package in Ubuntu: New Bug description: I initially posted this bug to the Firefox issue tracker here: https://bugzilla.mozilla.org/show_bug.cgi?id=1596397, but we determined it was specific to the Ubuntu package. When I play the video in this JSFiddle: https://jsfiddle.net/ea9h3bg7/, there should be no audio. This is the behavior in the Firefox 70 build that you can get from Mozilla's website. However, with the Ubuntu build, audio is still heard. --- Ubuntu 19.10, Firefox that shipped with the distro, upgraded to 70.0.1 via the Ubuntu update manager. Firefox package version: firefox: Installed: 70.0.1+build1-0ubuntu0.19.10.1 Candidate: 70.0.1+build1-0ubuntu0.19.10.1 Version table: *** 70.0.1+build1-0ubuntu0.19.10.1 500 500 http://fr.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu eoan-security/main amd64 Packages 100 /var/lib/dpkg/status 69.0.3+build1-0ubuntu1 500 500 http://fr.archive.ubuntu.com/ubuntu eoan/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1852645/+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

