--- a/dom/apps/AppsUtils.jsm
+++ b/dom/apps/AppsUtils.jsm
@@ -47,24 +47,17 @@ this.mozIApplication = function(aApp) {
   _setAppProperties(this, aApp);
 }
 
 mozIApplication.prototype = {
   hasPermission: function(aPermission) {
     // This helper checks an URI inside |aApp|'s origin and part of |aApp| has a
     // specific permission. It is not checking if browsers inside |aApp| have such
     // permission.
-    let principal = this.principal;
-    if (this.installerIsBrowser) {
-      let uri = Services.io.newURI(this.origin, null, null);
-      principal =
-        Services.scriptSecurityManager.getAppCodebasePrincipal(uri, this.localId,
-                                                               /*mozbrowser*/false);
-    }
-    let perm = Services.perms.testExactPermissionFromPrincipal(principal,
+    let perm = Services.perms.testExactPermissionFromPrincipal(this.principal,
                                                                aPermission);
     return (perm === Ci.nsIPermissionManager.ALLOW_ACTION);
   },
 
   hasWidgetPage: function(aPageURL) {
     let uri = Services.io.newURI(aPageURL, null, null);
     let filepath = AppsUtils.getFilePath(uri.path);
     let eliminatedUri = Services.io.newURI(uri.prePath + filepath, null, null);
@@ -79,17 +72,17 @@ mozIApplication.prototype = {
     }
 
     this._principal = null;
 
     try {
       this._principal = Services.scriptSecurityManager.getAppCodebasePrincipal(
         Services.io.newURI(this.origin, null, null),
         this.localId,
-        this.installerIsBrowser
+        false /* mozbrowser */
       );
     } catch(e) {
       dump("Could not create app principal " + e + "\n");
     }
 
     return this._principal;
   },
 

--- a/dom/apps/tests/unit/test_moziapplication.js
+++ b/dom/apps/tests/unit/test_moziapplication.js
@@ -50,16 +50,16 @@ add_test(() => {
                  "app[" + key + "] should be equal to mozapp[" + key + "]");
   });
 
   Assert.ok(mozapp.principal, "app principal should exist");
   let expectedPrincipalOrigin = app.origin + "!appId=" + app.localId;
   Assert.equal(mozapp.principal.origin, expectedPrincipalOrigin,
                "app principal origin ok");
   Assert.equal(mozapp.principal.appId, app.localId, "app principal appId ok");
-  Assert.equal(mozapp.principal.isInBrowserElement, app.installerIsBrowser,
+  Assert.equal(mozapp.principal.isInBrowserElement, false,
                "app principal isInBrowserElement ok");
   run_next_test();
 });
 
 function run_test() {
   run_next_test();
 }