diff --git a/extension/extension-purpose.js b/extension/extension-purpose.js
--- a/extension/extension-purpose.js
+++ b/extension/extension-purpose.js
@@ -17,6 +17,10 @@
 
 let purposeShareMenuId = "purpose_share";
 
+// Stores <notification id, share url> so that when you click the finished
+// notification it will open the URL
+let purposeNotificationUrls = {};
+
 function purposeShare(data) {
     return new Promise((resolve, reject) => {
         sendPortMessageWithReply("purpose", "share", {data}).then((reply) => {
@@ -43,6 +47,12 @@
                     title: chrome.i18n.getMessage("purpose_share_finished_title"),
                     message: chrome.i18n.getMessage("purpose_share_finished_text", url),
                     iconUrl: "icons/document-share.png"
+                }, (notificationId) => {
+                    if (chrome.runtime.lastError) {
+                        return;
+                    }
+
+                    purposeNotificationUrls[notificationId] = url;
                 });
             }
 
@@ -104,3 +114,16 @@
 addRuntimeCallback("purpose", "share", (message, sender, action) => {
     return purposeShare(message);
 });
+
+chrome.notifications.onClicked.addListener((notificationId) => {
+    const url = purposeNotificationUrls[notificationId];
+    if (url) {
+        delete purposeNotificationUrls[notificationId];
+
+        chrome.tabs.create({url});
+    }
+});
+
+chrome.notifications.onClosed.addListener((notificationId) => {
+    delete purposeNotificationUrls[notificationId];
+});
diff --git a/extension/utils.js b/extension/utils.js
--- a/extension/utils.js
+++ b/extension/utils.js
@@ -22,12 +22,29 @@
 
     static get() {
         return new Promise((resolve, reject) => {
-            SettingsUtils.storage().get(DEFAULT_EXTENSION_SETTINGS, (items) => {
+            SettingsUtils.storage().get(null /* get all */, (items) => {
                 const error = chrome.runtime.lastError;
                 if (error) {
                     return reject(error);
                 }
 
+                // Passing a default Object get() only returns defaults for the top level of the object,
+                // so we need to merge the level underneath manually.
+                const addObjectInto = (obj, add) => {
+                    if (typeof add !== "object" || Array.isArray(add)) {
+                        return;
+                    }
+
+                    Object.keys(add).forEach((key) => {
+                        if (!obj.hasOwnProperty(key)) {
+                            obj[key] = add[key];
+                        } else {
+                            addObjectInto(obj[key], add[key]);
+                        }
+                    });
+                };
+
+                addObjectInto(items, DEFAULT_EXTENSION_SETTINGS);
                 resolve(items);
             });
         });