--- a/toolkit/components/extensions/.eslintrc
+++ b/toolkit/components/extensions/.eslintrc
@@ -7,21 +7,19 @@
     "Components": true,
     "Cr": true,
     "Cu": true,
     "dump": true,
     "TextDecoder": false,
     "TextEncoder": false,
     // Specific to WebExtensions:
     "Extension": true,
-    "ExtensionContext": true,
     "ExtensionManagement": true,
     "extensions": true,
     "global": true,
-    "GlobalManager": true,
     "NetUtil": true,
     "openOptionsPage": true,
     "require": false,
     "runSafe": true,
     "runSafeSync": true,
     "runSafeSyncWithoutClone": true,
     "Services": true,
     "TabManager": true,

--- a/toolkit/components/extensions/Extension.jsm
+++ b/toolkit/components/extensions/Extension.jsm
@@ -140,20 +140,18 @@ var Management = {
         promises.push(Schemas.load(url));
       }
       return Promise.all(promises);
     });
 
     for (let [/* name */, value] of XPCOMUtils.enumerateCategoryEntries(CATEGORY_EXTENSION_SCRIPTS)) {
       let scope = {
         get console() { return console; },
-        ExtensionContext,
         extensions: this,
         global: scriptScope,
-        GlobalManager,
         require,
       };
       Services.scriptloader.loadSubScript(value, scope, "UTF-8");
 
       // Save the scope to avoid it being garbage collected.
       this.scopes.push(scope);
     }