Examine source code of Compare MoodleDocs

{
  "description": "Visit any page within the MoodleDocs (DE or EN), right-click, select „Compare MoodleDocs“ plus the version to compare with. A diff checker will visualize the differences.",
  "manifest_version": 2,
  "name": "MoodleDocs",
  "version": "18.4.28resigned1",
  "applications": {
    "gecko": {
      "id": "jid0-pPz6qU2Bg8x0jUAftgHfQfmqfUw@jetpack"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "64": "icons/icon-64.png"
    },
    "default_title": "Open MoodleDocs"
  },
  "homepage_url": "https://docs.moodle.org/",
  "icons": {
    "64": "icons/icon-64.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ]
}