Examine source code of Save All Tab URLs

{
  "manifest_version": 2,
  "name": "Save All Tab URLs",
  "description": "Get the raw URLs of all your open tabs!",
  "version": "0.1.4",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png",
    "256": "icons/logo-256.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/logo-48.png",
      "96": "icons/logo-96.png",
      "256": "icons/logo-256.png"
    }
  },
  "permissions": [
    "tabs"
  ]
}