Does that also happen with a clean new profile (https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles)? If not, you could switch back to your broken profile and refresh FF (https://support.mozilla.org/en-US/kb/ref...
You can file compatibility issues- via the 'Report broken site' option (https://support.mozilla.org/en-US/kb/report-breakage-due-blocking) (Send technical and interaction data to Mozilla must be enabled)- on webcompat.com (https://webcompat.com/issue...
