You can remove a possible cookie exception for www.facebook.com and create an exception for facebook.com instead to include all facebook domains (bug 783358).

I already have such an exception. FB remembers who I am. The only change is whether I have it "ask every time" or not. The rest of FB works either way, just those features.

"ask every time" doesn't appear to work well with Firefox, so if you use that cookie setting then you need to correct this and add the exception for the facebook.com yourself manually to make the site work properly.

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That was in fact the correct answer. I checked, and until just now I did have the exception for www.facebook.com, not facebook.com. When I followed your instruction, it worked. Thanks!

This does seem to be an error in Firefox, though. Why is it accepting a cookie for ".facebook.com", when it asked me in the dialog (and recorded as the exception) about www.facebook.com? That seems to be where the problem lies.

How would I flag up what is obviously an actual Firefox bug?

try to remove the website(facebook.com) from cookies exception. if you don't know, reset your firefox here is the link http://support.mozilla.org/kb/reset-preferences-fix-problems

Jaya, try reading the posts before trying to "help" next time. Thanks.

@bughunt92834 Sorry, may i know which version of firefox are you using. Stable firefox or Firefox Beta or Firefox Aurora or Firefox Nightly.

you can file a bug in www.bugzilla.org

I gave my Firefox version both at the start of my original post, AND it's in the "system details" panel in the top right. Kindly learn to read the posts before posting yourself.

And you even got the Mozilla bug URL wrong! It's actually https://bugzilla.mozilla.org/