Have you tried adjusting or disabling the "Enhanced Tracking Protection" feature in Firefox? You can improve compatibility (at the cost of some unique privacy protections) by changing to "Standard" mode instead of "Strict." If your browser is currently on "Strict," that could potentially be causing it to break. You can change this setting by going to the "hamburger menu" (three horizontal lines) in the upper right of the toolbar, clicking on Settings, then selecting the "Privacy & Security" option on the left side.

Or, you can temporarily disable this feature by clicking on the shield at the left side of Firefox's address bar, and flipping the slider to off (left).

After doing either one of these, try refreshing the page to see if that works. No guarantee that this will help, but I would give it a try.

Does it still happen in Troubleshoot Mode?