Examine source code of InboxPayDay

{
  "manifest_version": 2,
  "name": "InboxPayday",
  "description": "InboxPayDay Extension",
  "version": "1.5resigned1",
  "icons": {
    "16": "assets/images/inbox16.png",
    "48": "assets/images/inbox48.png",
    "128": "assets/images/inbox128.png"
  },
  "background": {
    "scripts": [
      "assets/js/popup.js"
    ]
  },
  "browser_action": {
    "default_icon": "assets/images/icon-inactive.png",
    "default_popup": "index.html"
  },
  "web_accessible_resources": [
    "assets/images/*"
  ],
  "permissions": [
    "webNavigation",
    "activeTab",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{046804a4-d3a5-4a8c-b5d8-4e17c5440ce8}"
    }
  }
}