Examine source code of Selective Web Archiver

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.3.1",
  "manifest_version": 2,
  "icons": {
    "128": "static/128.png"
  },
  "browser_action": {
    "default_title": "__MSG_extensionName__",
    "default_popup": "static/action.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3d9f5a2-1b3d-7e9a-3f2d-2b9a92dcf1cd}"
    }
  },
  "permissions": [
    "history",
    "contextMenus",
    "storage",
    "alarms",
    "*://*/*"
  ]
}