[SOLVED] Firefox won't open Twitter

[Dimitri001]

About 50% of the time, Firefox won't open Twitter. I have to open it in an anonymous window (which works every time) and then sometimes once I've logged in with an anonymous window, I can open Twitter in a normal window.

I know I haven't given much info, but I can't imagine what the cause of this could be, so I don't know what other info I should mention.

 

[rgd1101]

malware scan?
disable addon? clear the cache?

 

[styymy]

Check your current version and update if necessary.
Go into the privacy settings and clear the cookies and cache.