Examine source code of Github Unicode Highlight

{
  "manifest_version": 2,
  "name": "Github Unicode Highlight",
  "version": "1.0.4resigned1",
  "description": "Highlights Unicode characters in PRs on Github",
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*/*/pull/*/files"
      ],
      "js": [
        "pr-check.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c865c60f-16f7-42c4-b44d-858785e6a33e}"
    }
  }
}