firefox startpage

I am using firefox with Thinstation. And I would like to change the start 
page of firefox. Someone knows how to do that? I found something in the 
all.js file:

// 
pref("startup.homepage_override_url","chrome://browser-region/locale/region.properties");
pref("browser.chromeURL","chrome://browser/content/");
pref("browser.hiddenWindowChromeURL", 
"chrome://browser/content/hiddenWindow.xul");
pref("xpinstall.dialog.confirm", 
"chrome://mozapps/content/xpinstall/xpinstallConfirm.xul");
pref("xpinstall.dialog.progress", 
"chrome://mozapps/content/downloads/downloads.xul");
pref("xpinstall.dialog.progress.type", "Download:Manager");

pref("keyword.enabled", true);
pref("keyword.URL", 
"http://www.google.com/search?btnI=I%27m+Feeling+Lucky&ie=UTF-8&oe=UTF-8&q=";);

pref("general.useragent.locale", "chrome://global/locale/intl.properties");
pref("general.useragent.contentlocale", 
"chrome://browser-region/locale/region.properties");
pref("general.useragent.vendor", "Firefox");
pref("general.useragent.vendorSub", "0.8");

pref("general.smoothScroll", false);
pref("general.autoScroll", true);

pref("backups.number_of_prefs_copies", 1);

// 0 = blank, 1 = home (browser.startup.homepage), 2 = last
// XXXBlake Remove this stupid pref
pref("browser.startup.page",                1);
pref("browser.startup.homepage",	          
"chrome://browser-region/locale/region.properties");
// "browser.startup.homepage_override" was for 4.x
pref("browser.startup.homepage_override.1", false);

can someone tell me how to change the start page in?.www.google.com?? fore 
example.

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