Look for "Shockwave Flash" and change "Always Activate" to "Ask to Activate". "3-bar" menu button (or Tools menu) > Add-ons.This will delay Flash from starting on a page until you approve it. Try setting Flash to Click-to-Play ("Ask to Activate"). Note: it doesn't turn off automatically when you switch away from the tab. (3) Double-click the media.block-play-until-visible preference to switch the value from false to true (2) In the search box above the list, type or paste visible and pause while the list is filtered Some users are looking for something a bit different which is for tabs opened in the background not to start autoplaying until you activate them.
(3) Double-click the preference to switch the value from true to false (2) In the search box above the list, type or paste autop and pause while the list is filtered Click the button promising to be careful. (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. In that case, to play the video, click the pause button then click the play button. This sometimes leads to the strange appearance of a pause button on a stopped video. a plugin such as Flash (I think you already have this set, but just in case)įirefox has an internal setting to stop videos from autoplaying.built-in HTML5 video player (for example, on YouTube).
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