I'm using latest Firefox 5.
Since last week, when I run Firefox by clicking the shortcut, it runs 6 instances instead of one instance.
How can I fix this error?
Isn't it just restoring the last state?
Try closing all of them one by one with Ctrl-W, and then lastly close the one you want to keep with Ctrl-W or Ctrl-Q.
I uninstalled FF and deleted all profile folders...Then I reinstalled it...It works normal now but I could not find the root cause...