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Re:The New Firefox and Ridiculous Numbers of Tabs by bigbugbag on Saturday July 22, 2017 @06:46AM (#14826462)
So what you say is that firefox does not do this. (unless you go deep in about:config which is highly discouraged by mozilla).
Re:The New Firefox and Ridiculous Numbers of Tabs by cyphar on Saturday July 22, 2017 @07:25AM (#14826628)
Firefox Nightly does, and it's not done by default in non-nightly (but you can enable it with "media.block-autoplay-until-in-foreground"). I imagine it will become the default eventually.

"Firefox doesn't do this" is not a valid one-sentence summary of what I just said.