''[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1282673. Please follow up there, thanks.]'' I've been having trouble with the functionality of the sites twitter and pinterest, twitter especially. There might be other sites affected by whatever this problem is, but twitter is the one I've been messing with the most. Upon logging into twitter, I can post new posts, but I cannot retweet, edit my account, or log off. Clearing my data/cache forces me to log out, but once I log back in, the problem simply returns. I've tried running firefox in safe mode, disabling all my extensions, and even messing with what cookies are allowed through, but all attempts seem ineffective. I've refreshed firefox to default settings and that hasn't worked. These sites are working fine when they're opened in firefox on my mobile device. They work fine when I open them in google chrome on my laptop. It's only firefox, running specifically on my laptop, that is getting this problem. I have no clue what to do at this point.