When i click on my mozilla icon on desktop it opens but i can't see anything, it just a white screen

firefox was working fine and when i went to sign back in all i got was a write screen that says Mozilla firefox at the very top but I have no tool bar and i can't do anything but close out of that window. can you help me with this problem?

Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

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    Same as question

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