The Worm Oroborous (As best I can spell it) (The worm that eats it's own tail) indicates that FF is still trying to load the site, but has not yet finished.. Some sites seem never to finish..
But... If the site is down. .That happens.. IF you open too many tabs at once you can also overload your connection.. and that happens.
I have found that clicking on the tab, then on the X which is on the address bar (NOTE you may have to add that one) to stop the tabe.. then clicking on the circular arrow on the address bar to re-load. Often loads the sites when I'm on a bandwidth limited connection.
Just now I'm on 4G which means they load faster than I can get my hand off the rodent.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times