Small perf tweak.

browser/base/content/all.js

@@ -51,6 +51,7 @@ pref("general.useragent.misc", "rv:0.1");
 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://navigator-region/locale/region.properties");
 // "browser.startup.homepage_override" was for 4.x

browser/base/content/browser.js

@@ -360,10 +360,10 @@ function Startup()
   gClickSelectsAll = pref.getBoolPref("browser.urlbar.clickSelectsAll");
 
   // set home button tooltip text
-  var homePage = getHomePage();
-  if (homePage) {
   var homeButton = document.getElementById("home-button");
-    if (homeButton)
+  if (homeButton) {
+    var homePage = getHomePage();
+    if (homePage)
       homeButton.setAttribute("tooltiptext", homePage);
   }