Firefox opens multiple times (many windows) when click once, even after a reinstall in Windows 7.

There really isn't much more to say, except that the situation occurs even after restarts.

The cause is most likely the preferences file in your profile folder. That file contains your personal settings, so it doesn't get deleted when you reinstall/update Firefox. The reset feature also retains your preferences file.
Instead of doing a mass delete of all your settings, you can try identify the culprits and reset them individually.
# In the [[Awesome Bar - Find your bookmarks, history and tabs when you type in the address bar|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear.
# Click '''I'll be careful, I promise!''', to continue to the about:config page.
# Click on the '''Status''' column, to sort your preferences by status, and group all the ''user set'' preferences together. They should appear in bold.
# If you see any preference that look suspicious, just '''right-click''' on it, and select '''Reset'''.
If you're still not sure which ones to reset, you can post most of them here easily. Go to '''Help > Troubleshooting Information''' then click '''Copy text to Clipboard'''. Open a reply to this post, and go to '''Edit > Paste''' to paste the info from your Troubleshooting Information page.

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