Hi Tonoos22, Firefox's built-in feature seems limited to videos that start shortly after page load. As you scroll around the page, you may trigger a script that starts a video that Firefox doesn't pick up. But let's see if we can maximize the functionality of the built-in feature first before looking at add-ons. Could you try a little experiment: (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 or accepting the risk. (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.default''' preference to display a dialog and change from '''0''' to '''1''' and click OK -- this is the same as checking the box on the Options page -- that should be enough for many sites (4) Double-click the '''media.autoplay.allow-muted''' preference to switch the value from true to false ''This is the odd one:'' (5) Double-click the '''media.autoplay.enabled.user-gestures-needed''' preference to switch the value from true to false -- previously setting this to true helped control videos, but in some user experiments, it worked better set to false Any difference?