Examine source code of Support context

{
  "manifest_version": 3,
  "name": "Support context",
  "version": "1.0.37",
  "description": "Add context about support on MDN documentation, using your own browserslist as a target.",
  "browser_specific_settings": {
    "gecko": {
      "id": "mdn-support-context@example.com"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/support-context.js"
      ],
      "matches": [
        "https://developer.mozilla.org/*"
      ]
    }
  ]
}