I am experiencing a flickering/highlighting effect on various webpages when using Firefox on some of my computers (a Microsoft Surface and Asus Laptop, but not my work desktop). Attached photos show an example from Gmail, where the one photo shows it open in Microsoft Edge (no flicker/highlighting effect) and the other photo shows it in Firefox. When my cursor moves it causes the greyed out portions to jump to other areas. I also see this in places like the toolbar, where the rounded edges of bookmarks are now sometimes a grey square, similar to the greyed out emails in the photo. I have restarted and reinstalled Firefox with no changes. Any idea what is causing this?