Examine source code of AutoEndorse

{
  "description": "Auto linkedin endorsements",
  "manifest_version": 2,
  "name": "AutoLinkedin",
  "version": "1.0",
  "homepage_url": "https://github.com/miltinhoc",
  "icons": {
    "48": "icons/48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "author": "Milton Cardoso",
  "browser_action": {
    "default_icon": "icons/48.png",
    "default_title": "Endorse",
    "default_popup": "popup/popup.html"
  }
}