I try to open firefox but it says firfox is all ready open. As a result, I have to restart computer.

This happened with 4.0 and previous version.

You could try Ctrl - Shift - Esc to open the Task Manager. Click the Processes TAB. Click the Image Name column header to sort the list. Locate firefox.exe. Right click it and click 'End Process'. Then try opening Firefox again.
No need to reboot.

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