Firefox not working on a lot of sites

[bjhansen53]

I have probably been using Firefox for 20 years and up until this past year I never had a problem. I am now constantly running across sites that I cannot access or do not work on Firefox. I wish I had kept a list because it would have been a long one. It has gotten to the point that I am considering using another browser for my default. I have tried getting this question answered several times and have gotten no response. If I do not get one soon, I will have to drop Firefox as my default browser. This is not a problem that I have had on just one computer, but on all 5 that I use.

[danmhi]

Please report any broken websites trough our reporting tool:
https://support.mozilla.org/en-US/kb/report-breakage-due-blocking

We're actively looking into these and figuring out mitigations.

In case you have ETP Strict turned on, be aware that certain elements on the websites might be unavailable because they are classified as trackers and we are blocking them. This is expected behavior in this mode.

[JimLongIsland]

I am having the same issue. I run Firefox 131.03 64 bit on Windows 11 and for awhile now have been having serious issues. When I try troubleshooting mode in Firefox the problems do not go away. As an example, today ,on the Washington Post site, most articles work but all political cartoons come up blank. Switch to Chrome and they work. On many sites clicking login buttons gets no response while in Chrome they work fine. This makes Firefox such a hit or miss that I have to switch my default browser.

[PonchT]

The employee that discusses "ETP" has provided accurate information. 
In order to resolve the issue and allow the applicable website(s) to load:

Go to Settings
Type Enhanced in the Search section (or go to Privacy and Security)
Select Manage Exceptions
Enter the address of the website(s) that are not loading/completing
Save Exceptions
Reload site(s)

Another option is to simply click the "Shield" (typically to the left of where you type the URL)

There have been  few websites where, oddly, if you click the shield again to re-enable the will then properly load.