Examine source code of Github Relations

{
  "manifest_version": 2,
  "name": "Github Relations",
  "version": "2.0.0",
  "description": "Show related branches at top issues, and related issues at top of PR's.",
  "icons": {
    "48": "logo-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "github-related-branches@noitidart.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*/*/issues/*"
      ],
      "js": [
        "related-branches.js"
      ]
    },
    {
      "matches": [
        "*://github.com/*/*/pull/*"
      ],
      "js": [
        "related-issues.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "storage",
    "https://api.github.com/*"
  ]
}