Examine source code of GitHub Mentions+

{
  "manifest_version": 3,
  "name": "GitHub Mentions+",
  "description": "Enhance GitHub @mention autocomplete by adding custom team members or external collaborators.",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "github-mentions-plus@example.com",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "64": "icons/icon.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.github.com/*",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "utils/storage.js",
        "utils/api.js",
        "utils/dom.js",
        "content_script.js"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "64": "icons/icon.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "GitHub Mentions+"
  }
}