URL bar
1. about:config
2. Search for "keyword.URL"
3. Change it to "https://www.google.com/search?q="
Search bar
new: Go to http://www.linuxmint.com/searchengines/anse.php?sen=Google&c=y, click the search bar and add it.
// old:
1. Find your Firefox profile location (http://kb.mozillazine.org/Profile_folder_-_Firefox)
2. cp google.xml searchplugins/ # find a sample google.xml below
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Sample google.xml (modified from /usr/share/linuxmint/adjustments/firefox/google.xml)
