It appears like most news site usually starts playing video automatically nowadays. These could sometimes be amazingly irritating, but thankfully, it’s pretty much easy to block on Firefox web browser.
Ordinarily, Firefox permits autoplay content as their default setting. However, it won’t start playing until the video frame is visible on your screen. This helps in preventing websites from hiding video content behind other content or at the bottom of the page.
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You won’t find a toggle for autoplay in the regular Firefox options menu—it’s hidden in Firefox’s secret about:config advanced menu. Right now we’re only interested in the media autoplay settings, so open a new tab and paste “about:config?filter=autoplay” into the search column.
As long as you know what you’re doing or follow this instructions carefully, you won’t mess anything up. (And if you ever do mess something up, you can fix it by simply “refreshing” Firefox). Simply go ahead and uncheck “Show this warning next time”, then click “I accept the risk!”
This will bring you to the about:config page, pre-filtered to only show options with “autoplay” in their name. Double-click on “media.autoplay.enabled” to switch it from true to false.
You’ll notice that the text is now bold. Any setting that has been changed in about:config will have bold text, and the “Status” field will read “modified”. You’ll also notice there’s one more option, “media.block-autoplay-until-in-foreground”. You’ll want to leave this set to true.
Most about:config changes (including these two) take effect immediately, so there’s no need for a restart. If for any reason you want to turn autoplay back on, you can double-click on “media.autoplay.enabled” again to switch it back on.