Change firefox google.com search engine to google.co.id

Firefox distribution included on linux distribution. we couldn't denial that google is the most awesome search engine on the net. the default search engine on firefox is google.com . I use primarily google.co.id to search because its often came up with Indonesian language first. after browsing the web and a little of experiment I manage to change the default google search engine to google.co.id

here's ho :
1. Open teriminal
2. cd /usr/share/firefox/searchplugins
3. vim google.xml (or whatever editor you use)
4. edit the following line :

<url type="text/html" method="GET" template="http://www.google.com/search">

to

<url type="text/html" method="GET" template="http://www.google.co.id/search">


5. save the file (on vim type ":w" without the quote)
6. restart the firefox