Change the API back to be the correct key so only the permission is different

webextension-experiment/api.js

@@ -26,7 +26,7 @@ function getCookieStoreIdForContainer(containerId) {
 class API extends ExtensionAPI {
   getAPI(context) {
     let self = {
-      contextualidentities: {
+      contextualIdentities: {
         get(cookieStoreId) {
           let containerId = getContainerForCookieStoreId(cookieStoreId);
           if (!containerId) {

webextension-experiment/schema.json

@@ -1,6 +1,6 @@
 [
   {
-    "namespace": "contextualidentities",
+    "namespace": "contextualIdentities",
     "description": "Use the <code>browser.contextualIdentities</code> API to query and modify contextual identity, also called as containers.",
     "permissions": ["contextualidentities"],
     "types": [