This can be caused by corrupted cookies or cookies that are blocked (check the permissions on the about:permissions page).

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Thanks for your quick response. Tried both of these solutions and, unfortunately, it didn't help.

Any other ideas?

I've attached a screengrab of what I'm seeing if that helps at all...

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Gave this a whirl and still no joy...

Go to the site, and before you log in, disable Adblock for that site only. See if that helps.

Thanks for your input, however Adblock was completely disabled when I ran Firefox in Safe Mode and didn't rectify the situation...

Any more ideas, guys? It's pretty sh*tty that I can do all this with ease on IE and Chrome but not on my beloved Firefox

Hi,

Can't access HBO GO from europe so here is a long shot. Enable "Accept third party cookies". For details see

https://support.mozilla.org/en-US/kb/enable-and-disable-cookies-website-preferences#w_how-do-i-change-cookie-settings

That seems to do the trick! Awesome, thank you so much for your help!