made some suggested changes

src/js/background/assignManager.js

@@ -418,7 +418,7 @@ const assignManager = {
       const [bookmarkTreeNode] = 
         await browser.bookmarks.get(info.bookmarkId);
       if (bookmarkTreeNode.type === "folder") {
-        return await browser.bookmarks.getChildren(bookmarkTreeNode.id);
+        return browser.bookmarks.getChildren(bookmarkTreeNode.id);
       }
       return [bookmarkTreeNode];
     }
@@ -515,7 +515,7 @@ const assignManager = {
     // Ensure we have a cookieStore to assign to
     if (cookieStore
         && this.isTabPermittedAssign(tab)) {
-      return await this.storageArea.get(tab.url);
+      return this.storageArea.get(tab.url);
     }
     return false;
   },

src/js/background/backgroundLogic.js

@@ -324,7 +324,7 @@ const backgroundLogic = {
     containerState.hiddenTabs = [];
 
     await Promise.all(promises);
-    return await identityState.storageArea.set(options.cookieStoreId, containerState);
+    return identityState.storageArea.set(options.cookieStoreId, containerState);
   },
 
   cookieStoreId(userContextId) {

src/js/background/identityState.js

@@ -39,7 +39,7 @@ const identityState = {
 
     async remove(cookieStoreId) {
       const storeKey = this.getContainerStoreKey(cookieStoreId);
-      return await this.area.remove([storeKey]);
+      return this.area.remove([storeKey]);
     },
 
     /*
@@ -107,13 +107,13 @@ const identityState = {
   },
 
   async updateUUID(cookieStoreId, uuid) {
-    if (cookieStoreId && uuid) {
-      const containerState = await this.storageArea.get(cookieStoreId);
-      containerState.macAddonUUID = uuid;
-      await this.storageArea.set(cookieStoreId, containerState);
-      return uuid;
-    } 
-    throw new Error ("cookieStoreId or uuid missing");
+    if (!cookieStoreId || !uuid) {
+      throw new Error ("cookieStoreId or uuid missing");
+    }
+    const containerState = await this.storageArea.get(cookieStoreId);
+    containerState.macAddonUUID = uuid;
+    await this.storageArea.set(cookieStoreId, containerState);
+    return uuid;
   },
 
   async addUUID(cookieStoreId) {

src/js/background/sync.js

@@ -5,11 +5,11 @@ const sync = {
     area: browser.storage.sync,
 
     async get(){
-      return await this.area.get();
+      return this.area.get();
     },
 
     async set(options) {
-      return await this.area.set(options);
+      return this.area.set(options);
     },
 
     async deleteIdentity(deletedIdentityUUID) {
@@ -87,7 +87,7 @@ const sync = {
         .replace(/\//, "");
     },
     async removeInstance(installUUID) {
-      console.log("removing", installUUID);
+      if (SYNC_DEBUG) console.log("removing", installUUID);
       await this.area.remove(installUUID);
       return;
     },
@@ -118,7 +118,7 @@ const sync = {
         await this.deleteSite(options.siteStoreKey);
       if (options && options.undeleteSiteStoreKey) 
         await removeFromDeletedSitesList(options.undeleteSiteStoreKey);
-      console.log("Backed up!");
+      if (SYNC_DEBUG) console.log("Backed up!");
       await sync.checkForListenersMaybeAdd();
 
       async function updateSyncIdentities() {
@@ -150,7 +150,7 @@ const sync = {
         const date = new Date();
         const timestamp = date.getTime();
         const installUUID = sync.storageArea.getInstanceKey();
-        console.log("adding", installUUID);
+        if (SYNC_DEBUG) console.log("adding", installUUID);
         const identities = [];
         const siteAssignments = [];
         for (const identity of identitiesInput) {
@@ -208,7 +208,7 @@ const sync = {
 
   async errorHandledRunSync () {
     await sync.runSync().catch( async (error)=> { 
-      console.error("Error from runSync", error);
+      if (SYNC_DEBUG) console.error("Error from runSync", error);
       await sync.checkForListenersMaybeAdd();
     });
   },
@@ -257,7 +257,7 @@ const sync = {
       console.log("Initial State:", {syncInfo, localInfo, idents});
     }
     await sync.checkForListenersMaybeRemove();
-    console.log("runSync");
+    if (SYNC_DEBUG) console.log("runSync");
 
     await identityState.storageArea.upgradeData();
     await assignManager.storageArea.upgradeData();
@@ -308,7 +308,7 @@ const sync = {
 sync.init();
 
 async function restore() {
-  console.log("restore");
+  if (SYNC_DEBUG) console.log("restore");
   await reconcileIdentities();
   await reconcileSiteAssignments();
   return;
@@ -320,7 +320,7 @@ async function restore() {
  * different.
  */
 async function reconcileIdentities(){
-  console.log("reconcileIdentities");
+  if (SYNC_DEBUG) console.log("reconcileIdentities");
 
   // first delete any from the deleted list
   const deletedIdentityList =
@@ -443,7 +443,7 @@ async function ifUUIDMatch(syncIdentity, localCookieStoreID) {
 
 async function ifNoMatch(syncIdentity){
   // if no uuid match either, make new identity
-  console.log("create new ident: ", syncIdentity.name);
+  if (SYNC_DEBUG) console.log("create new ident: ", syncIdentity.name);
   const newIdentity = 
         await browser.contextualIdentities.create({
           name: syncIdentity.name, 
@@ -463,7 +463,7 @@ async function ifNoMatch(syncIdentity){
  * If it does not exist, it is created.
  */
 async function reconcileSiteAssignments() {
-  console.log("reconcileSiteAssignments");
+  if (SYNC_DEBUG) console.log("reconcileSiteAssignments");
   const assignedSitesLocal = 
     await assignManager.storageArea.getAssignedSites();
   const assignedSitesFromSync = 

src/js/popup.js

@@ -187,7 +187,7 @@ const Logic = {
     };
     // Handle old style rejection with null and also Promise.reject new style
     try {
-      return await browser.contextualIdentities.get(cookieStoreId) || defaultContainer;
+      return browser.contextualIdentities.get(cookieStoreId) || defaultContainer;
     } catch (e) {
       return defaultContainer;
     }
@@ -357,12 +357,12 @@ const Logic = {
 
   getAssignmentObjectByContainer(userContextId) {
     if (userContextId) {
-      return browser.runtime.sendMessage({
-        method: "getAssignmentObjectByContainer",
-        message: { userContextId }
-      });
+      return {};
     }
-    return {};
+    return browser.runtime.sendMessage({
+      method: "getAssignmentObjectByContainer",
+      message: { userContextId }
+    });
   },
 
   setOrRemoveAssignment(tabId, url, userContextId, value) {