Examine source code of Append to Links

{
  "manifest_version": 2,
  "name": "Append to links",
  "version": "0.2",
  "description": "Right-click on URL and open with parameters in a new tab",
  "permissions": [
    "contextMenus",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "options_page": "html/options.html",
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ExpandLinks@eskilander.se"
    }
  }
}