Bug 719318 - Better default window sizes. r=dolske

browser/base/content/browser.js

@@ -1270,19 +1270,33 @@ var gBrowserInit = {
 
     // Set a sane starting width/height for all resolutions on new profiles.
     if (!document.documentElement.hasAttribute("width")) {
-      let defaultWidth = 994;
+      let defaultWidth;
       let defaultHeight;
+
+      // Very small: maximize the window
+      // Portrait  : use about full width and 3/4 height, to view entire pages
+      //             at once (without being obnoxiously tall)
+      // Widescreen: use about half width, to suggest side-by-side page view
+      // Otherwise : use 3/4 height and width
       if (screen.availHeight <= 600) {
         document.documentElement.setAttribute("sizemode", "maximized");
         defaultWidth = 610;
         defaultHeight = 450;
       }
       else {
-        // Create a narrower window for large or wide-aspect displays, to suggest
-        // side-by-side page view.
-        if (screen.availWidth >= 1600)
+        if (screen.availWidth <= screen.availHeight) {
+          defaultWidth = screen.availWidth * .9;
+          defaultHeight = screen.availHeight * .75;
+        }
+        else if (screen.availWidth >= 2048) {
           defaultWidth = (screen.availWidth / 2) - 20;
-        defaultHeight = screen.availHeight - 10;
+          defaultHeight = screen.availHeight - 10;
+        }
+        else {
+          defaultWidth = screen.availWidth * .75;
+          defaultHeight = screen.availHeight * .75;
+        }
+
 #ifdef MOZ_WIDGET_GTK2
         // On X, we're not currently able to account for the size of the window
         // border.  Use 28px as a guess (titlebar + bottom window border)