Private Browsing mode sometimes doesn't remember cookie info when opening links in new tabs
Also, when in Private Browsing mode, and I go to view the cookies in Options -> Privacy, I can see the cookies from the normal non-private browsing mode. All of them. It's not a fresh, clear, list like it should be.
I don't think any info is being read or recorded between the two sessions types, though. Just that sometimes, when opening a link in a new tab or window, it forgets the cookie information. Again, this is in Private Browsing mode.
I never had this problem until I upgraded to Firefox 19.
Re: Private Browsing mode sometimes doesn't remember cookie info when opening links in new tabs
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 or otherwise make changes.