Examine source code of AnyRaven

{
  "manifest_version": 2,
  "name": "AnyRaven",
  "description": "Customise your Cambridge Raven login raven.",
  "version": "1.0.1",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "MyRavenFirefox@dummy.uk"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://raven.cam.ac.uk/*"
      ],
      "js": [
        "assets/jquery-3.5.1.min.js",
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": {
      "128": "assets/icon-128.png"
    },
    "default_popup": "options/index.html",
    "default_title": "AnyRaven"
  },
  "options_ui": {
    "page": "options/index.html"
  }
}