Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now
If that does not fix it, then try:
Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
You can start Firefox in Safe Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshooting extensions and themes and Troubleshooting plugins
If it does work in Safe-mode then disable all your extensions and
then try to find which is causing it by enabling one at a time until
the problem reappears.
You can use "Disable all add-ons" on the Safe mode start window.
You have to close and restart Firefox after each change via File > Exit (on Mac: Firefox > Quit)
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