--- a/toolkit/components/extensions/Extension.jsm
+++ b/toolkit/components/extensions/Extension.jsm
@@ -375,29 +375,16 @@ class ExtensionChildProxyContext extends
   shutdown() {
     Management.emit("page-shutdown", this);
     super.shutdown();
   }
 }
 
 function findPathInObject(obj, path, printErrors = true) {
   for (let elt of path.split(".")) {
-    // If we get a null object before reaching the requested path
-    // (e.g. the API object is returned only on particular kind of contexts instead
-    // of based on WebExtensions permissions, like it happens for the devtools APIs),
-    // stop searching and return undefined.
-    // TODO(robwu): This should never be reached. If an API is not available for
-    // a context, it should be declared as such in the schema and enforced by
-    // `shouldInject`, for instance using the same logic that is used to opt-in
-    // to APIs in content scripts.
-    // If this check is kept, then there is a discrepancy between APIs depending
-    // on whether it is generated locally or remotely: Non-existing local APIs
-    // are excluded in `shouldInject` by this check, but remote APIs do not have
-    // this information and will therefore cause the schema API generator to
-    // create an API that proxies to a non-existing API implementation.
     if (!obj || !(elt in obj)) {
       if (printErrors) {
         Cu.reportError(`WebExtension API ${path} not found (it may be unimplemented by Firefox).`);
       }
       return null;
     }
 
     obj = obj[elt];

--- a/toolkit/components/extensions/ExtensionUtils.jsm
+++ b/toolkit/components/extensions/ExtensionUtils.jsm
@@ -2037,26 +2037,24 @@ class SchemaAPIManager extends EventEmit
    *
    * @returns {object} A sandbox that is used as the global by `loadScript`.
    */
   _createExtGlobal() {
     let global = Cu.Sandbox(Services.scriptSecurityManager.getSystemPrincipal(), {
       wantXrays: false,
       sandboxName: `Namespace of ext-*.js scripts for ${this.processType}`,
     });
-    Object.defineProperty(global, "console", {get() { return console; }});
-    global.extensions = this;
-    global.global = global;
-    global.Cc = Cc;
-    global.Ci = Ci;
-    global.Cu = Cu;
-    global.Cr = Cr;
+
+    Object.assign(global, {global, Cc, Ci, Cu, Cr, XPCOMUtils, extensions: this});
+
+    XPCOMUtils.defineLazyGetter(global, "console", getConsole);
+
     XPCOMUtils.defineLazyModuleGetter(global, "require",
                                       "resource://devtools/shared/Loader.jsm");
-    global.XPCOMUtils = XPCOMUtils;
+
     return global;
   }
 
   /**
    * Load an ext-*.js script. The script runs in its own scope, if it wishes to
    * share state with another script it can assign to the `global` variable. If
    * it wishes to communicate with this API manager, use `extensions`.
    *