Recreate tab objects when extension installed. (#1463)

- On service worker restart we'll restore the tab state
- On update/install we create the tab objects fresh

shared/js/background/startup.es6.js

@@ -45,7 +45,8 @@ export async function onStartup () {
         const tab = savedTabs[i]
 
         if (tab.url) {
-            tabManager.restore(tab.id)
+            // On reinstall we wish to create the tab again
+            await tabManager.restoreOrCreate(tab)
         }
     }
 

shared/js/background/tab-manager.es6.js

@@ -36,11 +36,19 @@ class TabManager {
         return newTab
     }
 
+    async restoreOrCreate (tabData) {
+        const restored = await this.restore(tabData.id)
+        if (!restored) {
+            await this.create(tabData)
+        }
+    }
+
     async restore (tabId) {
         const restoredState = await Tab.restore(tabId)
         if (restoredState) {
             this.tabContainer[tabId] = restoredState
         }
+        return restoredState
     }
 
     delete (id) {