I new-tab a link and if I leave that page and look at another I can't go back to the original page.
So I'm surfing on something like wikipedia and I see a link (B) for something related to the current article (A) that seems interesting. Because I don't want to leave (A) just yet, I right-click, then new tab (B) and continue. Now if in (B) I decide to look at another link or a picture (C) on (B) I can't go back to (B) afterward. The back button just forgets that it ever existed. Sometimes I'm lucky and I still have (A) up or (C) has a link back to (B) but Firefox 3 didn't have this problem.
Todas as respostas (2)
Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."
If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...
This issue can be caused by the McAfee SiteAdvisor, so start with that extension.