Weird problems with Firefox

[TSE]

I am experiencing weird problems with Firefox however, how do I reset Firefox completely, deleting everything I once did with it, so when I open it, it is like I just installed Firefox for the first time?

 

[Tomorrow]

Drag the app and all associated folders into the trash, then do a reinstall. Save your bookmarks first, though.

 

[angelwatt]

The associated files other than the app itself:

• ~/Library/Application Support/Firefox/
• ~/Library/Preferences/org.mozilla.firefox.plist

The ~ refers to your home directory.