diff --git a/browser/components/preferences/in-content/main.js b/browser/components/preferences/in-content/main.js
index bf29bd20caff..71284c1f7dd3 100644
--- a/browser/components/preferences/in-content/main.js
+++ b/browser/components/preferences/in-content/main.js
@@ -687,30 +687,6 @@ var gMainPane = {
    *   occurs at startup, false otherwise
    */
 
-   /**
-    * Firefox can attempt to set itself as the default application
-    * for all related filetypes or just for HTML. Some platforms
-    * such as Windows have terrible UIs for all filetypes. In those
-    * platforms, Firefox only attempts to associate itself with HTML.
-    */
-   shouldClaimAllTypes: function()
-   {
-    let claimAllTypes = true;
-    try {
-      if (AppConstants.platform == "win") {
-        // In Windows 10+, the UI for selecting default protocol is much
-        // nicer than the UI for setting file type associations. So we
-        // only show the protocol association screen on Windows 10+.
-        // Windows 8.1 is version 6.3. The startup code still uses
-        // the default protocol dialog, but the preferences is more "advanced"
-        // and as such uses the file type associations.
-        let version = Services.sysinfo.getProperty("version");
-        claimAllTypes = (parseFloat(version) <= 6.3);
-      }
-    } catch (ex) {}
-    return claimAllTypes;
-   },
-
   /**
    * Show button for setting browser as default browser or information that
    * browser is already the default browser.
@@ -724,8 +700,7 @@ var gMainPane = {
       return;
     }
     let setDefaultPane = document.getElementById("setDefaultPane");
-    let claimAllTypes = gMainPane.shouldClaimAllTypes();
-    let selectedIndex = shellSvc.isDefaultBrowser(false, claimAllTypes) ? 1 : 0;
+    let selectedIndex = shellSvc.isDefaultBrowser(false, true) ? 1 : 0;
     setDefaultPane.selectedIndex = selectedIndex;
   },
 
@@ -738,8 +713,7 @@ var gMainPane = {
     if (!shellSvc)
       return;
     try {
-      let claimAllTypes = gMainPane.shouldClaimAllTypes();
-      shellSvc.setDefaultBrowser(claimAllTypes, false);
+      shellSvc.setDefaultBrowser(true, false);
     } catch (ex) {
       Cu.reportError(ex);
       return;