Firefox always prompts to start in safe mode.

Whenever I start Firefox, it shows a prompt that asks me if I want to continue in safe mode or to quit. It also shows me options like "Reset all user preferences" or "Disable all add-ons" that once checked, will allow me to press the "Make changes and continue" button.
My Firefox version and all my plugins/addons are up-to-date.
Here's what I've done so far:
1. I've already disabled all my plugins and add ons, then quit Firefox. When I open Firefox again, it still shows me the safe mode prompt.
2. I restarted my computer and ran Firefox, same deal.
3. I tried resetting my user preferences as a checkbox option in the prompt, then quit and reopen Firefox, same result.
4. I reinstalled Firefox by downloading the latest version (which I already have). The safe mode prompt still persists.
Mac OS X 10.7.3 (Lion), Firefox 10.0.2

I solved it. I've previously set my Quicksilver app to open Firefox with a trigger Option + Command + F. Holding the option key while opening Firefox will always show the Safe Mode prompt. I changed my trigger to Command + Shift + F, and now the safe mode prompt is gone :)

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    * Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
    * [[Troubleshooting extensions and themes]]
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