Examine source code of GitHub License Observer

{
  "manifest_version": 2,
  "name": "GitHub License Observer",
  "short_name": "GHLicenseObs",
  "version": "1.1.1",
  "description": "Annotate GitHub projects with information about their license.",
  "author": "Nicolas Martyanoff",
  "homepage_url": "https://github.com/galdor/github-license-observer",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "github-license-observer.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "*://raw.githubusercontent.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{415f19ba-ab3e-4bd3-bc2a-d15879fcd755}"
    }
  }
}