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Re:The New Firefox and Ridiculous Numbers of Tabs by kibwen on Friday July 21, 2017 @07:13PM (#14824439)
Do you have to enable it? I use Firefox Nightly, and have been observing this behavior for a long, long time. It's one of those things that's so minor and yet so important that I wonder how I went without it for so long.
Re:The New Firefox and Ridiculous Numbers of Tabs by fiveseven_ on Friday July 21, 2017 @07:26PM (#14824509)
I believe it is enabled by default now, and the value in about:config is `media.block-autoplay-until-in-foreground`
Re:The New Firefox and Ridiculous Numbers of Tabs by cpeterso on Friday July 21, 2017 @08:28PM (#14824740)
Thanks for the pref name. The feature is currently enabled by default only in the Firefox Nightly channel but you can use the pref to enable it in the Beta or Release channels.

https://bugzilla.mozilla.org/show_bug.cgi?id=1352014

Re:The New Firefox and Ridiculous Numbers of Tabs by bigbugbag on Saturday July 22, 2017 @06:20AM (#14826376)
It's disabled by default on regular firefox.

I prefer to disable media.autoplay.enabled which is enabled by default.