Certain websites are having their images broken. This only affects firefox and I've tried the troubleshooting steps, all of them except resetting firefox. One of the websites with the most issues is nexusmods.com. I've included screenshots that show how the site looks in firefox and how it looks in edge/chrome. As you can see from the pictures, the issue is with the navbar items. This happens on other websites as well, though not all of them.