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Pros: Works in all Windows computers, most updated and compatible command.
Cons: 3 liner
Replace fcisolutions.com with your site name.
This command modifies the preferences file of Firefox that is located in .mozilla/firefox/*.default/prefs.js. It edits the file with sed and the -i option. Then it searches the string "browser.startup.homepage", and the string next to it (second string). Finally, it replaces the second string with the new homepage, that is http://sliceoflinux.com in the example.
It doesn't work if you haven't set any homepage.