Backed out changeset b469fb3f8d08 (bug 1917373) for causing failures at browser_setDefaultBrowser.js. CLOSED TREE

Author: Butkovits Atila

browser/components/shell/ShellService.sys.mjs

@@ -595,13 +595,7 @@ export var ShellService = new Proxy(ShellServiceInternal, {
     if (name in target) {
       return target[name];
     }
-    // n.b. Functions may be present or absent dependent on whether the
-    // `nsIShellService` has been queried for the interface implementing it, as
-    // querying the interface adds it's functions to the queried JS object. This
-    // is more likely to happen for Firefox Desktop than a Firefox Background
-    // Task. The fix is to not rely on this behavior on the `nsIShellService`
-    // directly, and instead query the interface containing the function.
-    if (target.shellService && name in target.shellService) {
+    if (target.shellService) {
       return target.shellService[name];
     }
     Services.console.logStringMessage(