Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and
• Remove Cookies

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Cookies; Delete cookies to remove the information websites have stored on your computer {web link}

• Cache; How to clear the Firefox cache {web link}

If there is still a problem, Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?

While you are in safe mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

cleared cache and cookies for mail.com. firefox opened in safe mode, turned off hardware acceleration. same thing happens. logs me in, then logs me out soon as I click something in the mail.com account. this is on my mac.

on my windows 7 box, same browser version, no issues there. works fine on windows, and safari and chrome on the mac. I use to work on the mac in firefox at one time but not lately.

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Go to that message, and use the Undo link to its right.

Hmm, Interesting. I don't know Mac's and called for more help.

im not seeing anything to mark it solved or not solved. in the email I hit solved by accident but I'm not seeing anything to click on to undo that.

I have a spare mac, same firefox version. Im going to try it on that and see if it does the same thing. this has me baffled so I appreciate any help.

ok, works fine on my older imac. same version of firefox ESR, same wifi network. works fine as it should. Im running el capitan on the older mac, Sierra on the new mac (where it keeps logging me out). clearing cache, cookies, extensions off did nothing. this is weird. has me stumped. I may remove and reinstall firefox to see if that helps.

created a new profile in firefox. works fine now. mail.com works fine without logging me out. not sure whats in the old profile or what happened that made it not work. strange indeed.