You can always check the Mozilla Services Status to see if there's a wider issue affecting users in your area. Was this of the technical ID helpful, or how to join firefox blog - Mozilla Support
If you’re experiencing "fr-low" (French-language/Low) performance, try these steps immediately: Manage Your Performance Settings 4485812-6360754-win10-firefox-BE-fr-low-1670193123
Ensure your antivirus or firewall isn't throttling Firefox . You can always check the Mozilla Services Status
Sometimes your graphics card and Firefox don't talk to each other correctly. 4485812-6360754-win10-firefox-BE-fr-low-1670193123
