Finished storage polyfill.

src/js/polyfills/storage.manifest.json

 {
   "name": "storage",
   "status": "total",
   "coverage": 0.71,
   "dependencies": [
     {
       "name": "localforage",
       "path": "dist/localforage.min.js",
       "manager": "npm",
     }],
   "warnings": [
     {
       "member": "sync",
       "status": "partial",
-      "text": "has been replaced with chrome.storage.local. Storage will no longer be synchronised with Chrome profiles, and instead will fallback to storing locally.",
+      "text": "Replaced with chrome.storage.local. Storage will no longer be synchronised with Chrome profiles, and instead will fallback to storing locally.",
     },
     "sync.QUOTA_BYTES",
     "sync.QUOTA_BYTES_PER_ITEM",
     "sync.MAX_ITEMS",
     "sync.MAX_WRITE_OPERATIONS_PER_HOUR",
     "sync.MAX_WRITE_OPERATIONS_PER_MINUTE",
     "sync.MAX_SUSTAINED_WRITE_OPERATIONS_PER_MINUTE"
     "local.QUOTA_BYTES",
     {
       "member": "managed",
       "status": "partial",
-      "text": "has been replaced with chrome.storage.local. Calls will no longer be read-only.",
+      "text": "Replaced with chrome.storage.local. Calls will no longer be read-only.",
     },
-  ],
+    {
+      "member": "onChanged.addListener",
+      "status": "total",
+      "text": "A null area name will be given to the callback."
+    }
+  ]
 }