I can't seem to delete the INBOX tool bar that opens every time I open Firefox. I have uninstalled it in the programs, but it still shows up. I have chosen Google as my default.

Go to Firefox Addons and Disable/Uninstall it
If still it loads then you must search for it manually and delete it
If you have windows 7 then just type "INBOX" in searchbox at top right corner and Delete it (You must check that it must not be a system file *i searched and found no system file named inbox but still I warn you*
Then go to run and type "Regedit" and Press Enter
Then Press CTRl plus F (my Plus key is not working so I am typing full :p ) type inbox and search it again
Delete it's every occurrence unless it occurs in "wfs" folder