Examine source code of githubmoji

{
  "manifest_version": 2,
  "name": "githubmoji",
  "version": "1.1",
  "description": "Adds an gitmoji picker on GitHub commit message inputs.",
  "icons": {
    "48": "icons/githubmoji-icon-48.png",
    "96": "icons/githubmoji-icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "dist/index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd9a2102-31e2-427a-93b3-37e3199ea5ec}"
    }
  }
}