How do I reset Firefox without opening it?

2 Method 2 of 3: Resetting Firefox When It Won’t Open

1. Windows: Hold down ? Shift while opening Firefox. If this doesn’t work, search your computer for a "Mozilla Firefox (Safe Mode)" shortcut.
2. Mac: Hold down ? Option while opening Firefox.
3. Linux: Run /path/to/firefox/firefox -safe-mode from Terminal.

2 Method 2 of 3: Resetting Firefox When It Won’t Open

1. Windows: Hold down ? Shift while opening Firefox. If this doesn’t work, search your computer for a "Mozilla Firefox (Safe Mode)" shortcut.
2. Mac: Hold down ? Option while opening Firefox.
3. Linux: Run /path/to/firefox/firefox -safe-mode from Terminal.

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