I'm not aware of any plans along those lines. Firefox has an optional setting you can use to disable auto-play media. It's not perfect: if a site takes its time starting the media, it bypasses the block. But if you do want to try it: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste '''autop''' and pause while the list is filtered (3) Double-click the '''media.autoplay.enabled''' preference to switch the value from true to false You'll notice some strange things from time to time: * Media is paused, but there is a pause button. Disabling auto-play doesn't correct custom controls. To play, click pause, then click play. * Media is paused and there are no controls at all (for example, GIFV on Imgur). The authors of the page hid the controls. Right-click the media and click Show Controls. Then click Play. * You won't be able to start background music on sites where there are no controls. (Aw, shucks!) ---- As a footnote, Chrome's "not" autoplaying is really complicated and I don't think people are going to be delighted with it: https://developers.google.com/web/updates/2017/09/autoplay-policy-changes Let's see how that works out before imitating it.