basic extension

bluepill/background.js

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+'use strict';
+
+var browser = browser || chrome
+
+browser.runtime.onInstalled.addListener(function() {
+  browser.storage.sync.set({number: 0}, function() {
+    console.log('The number is set to 0.');
+  });
+});
+
+function updateIcon() {
+  browser.storage.sync.get('number', function(data) {
+    var current = data.number;
+    browser.browserAction.setIcon({path: 'icon' + current + '.png'});
+    current++;
+    if (current > 1)
+      current = 0;
+    browser.storage.sync.set({number: current}, function() {
+      console.log('The number is set to ' + current);
+    });
+  });
+};
+
+browser.browserAction.onClicked.addListener(updateIcon);
+//updateIcon();

bluepill/content.js

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+console.log("Extension is running");

bluepill/manifest.json

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+{
+  "homepage_url": "https://1000scores.com",
+  "name": "bluepill",
+  "browser_specific_settings": {
+  "gecko": {
+    "id": "addon@example.com",
+    "strict_min_version": "42.0"
+    }
+  },
+  "description": "changes your perspective on the web",
+  "version": "0.3",
+  "background": {
+     "scripts": ["background.js"],
+     "persistent": false
+   },
+  "permissions": ["storage"],
+  "browser_action": {
+      "name": "Click to change your browsers perspective",
+      "default_icon": "icon0.png"
+  },
+  "manifest_version": 2
+}