If you called me, here's what I'd tell you: '''First:''' Firefox has ''two'' consoles: (1) Web Console - Ctrl+Shift+K This lists error messages for the current tab. (2) Browser Console = Ctrl+Shift+J This lists error messages for Firefox as a whole and I suspect if that is a message from a web page, they mean the web console. '''Second:''' Please post the error messages from the web console. If those do not immediately identify the problem, then: '''Third:''' Test with Tracking Protection disabled. To do that, click the shield icon at the left end of the addres bar next to the lock. On the panel that drops down, click the blue slider switch to disable protection. Any improvement? If not, then: '''Fourth:''' Test in Firefox's Troubleshoot Mode. In that mode, Firefox temporarily deactivates extensions, hardware acceleration, any userChrome.css/userContent.css files, and some other advanced features to help you assess whether these are causing the problem. ''If Firefox is running:'' You can restart Firefox in Troubleshoot Mode using either: * "3-bar" menu button > Help > Troubleshoot Mode... * (menu bar) Help menu > Troubleshoot Mode... and OK the restart. A small dialog should appear. Click the Open button. ''If Firefox is not running:'' Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.) A small dialog should appear. Click the Open button. ''Note: Don't use the Refresh without first reviewing this article to understand what will be deleted:'' [[Refresh Firefox - reset add-ons and settings]]. Any improvement? Ref. [[Diagnose Firefox issues using Troubleshoot Mode]]