Switching between tabs, playing GIFs, playing YouTube videos, typing text and opening the Firefox menu are sometimes laggy. For example, sometimes when I click on a tab to view it, there will be a delay of a second before its contents are shown. I tried Google Chrome and it doesn't have this lag. My computer is pretty powerful. I tried safe mode, but the problem was present there, too. I tried clearing the cache, but no luck. I'm not sure what else to say, so if you would like more information, please just ask! Thank you.