Firefox has a native feature called Enhanced Tracking Protection (ETP). Because it blocks tracking scripts, maybe that sites misidentify it as a third-party adblocker.

Look for the Shield Icon to the left of the URL address bar.

Toggle the switch to OFF for the specific site giving you trouble.

or

Test in "Troubleshoot Mode", try this:

Go to Menu > Help > Troubleshoot Mode.

Click Restart.

If the website works fine here, one of your extensions or a custom setting is the culprit.

This did not solve the problem Too Bad

Hello

https://support.mozilla.org/en-US/questions/1575071 ? Other case, your antivirus computer protection security software. Other case, your hosts file.

You appear to be running ESR 140.9.1 according to the System Details, but since you are on Mac 10.15 you should be able to use the regular 149.0.2 release.

• https://www.mozilla.org/firefox/149.0.2/system-requirements/

You can find the full installer of the current Firefox release (149.0.2) in all languages and all operating systems here:

• https://www.mozilla.org/firefox/all/desktop-release/