Examine source code of Module Linker

{
  "id": "module-linker",
  "applications": {
    "gecko": {
      "id": "{fd697d8c-616c-4f6e-8509-0ed4a69e544e}",
      "strict_min_version": "53.0"
    }
  },
  "manifest_version": 2,
  "name": "Module Linker",
  "description": "Add direct links to imported modules on GitHub source code.",
  "version": "2.3.1",
  "author": "fiatjaf",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/*"
      ],
      "js": [
        "vendor/jquery.js",
        "vendor/jquery.pjax.js",
        "dist/full.js"
      ],
      "css": [
        "root.css",
        "links.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "open_in_tab": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://github.com/*/*",
    "https://api.github.com/repos/*",
    "https://raw.githubusercontent.com/*",
    "https://pypi.python.org/pypi/*/json",
    "https://registry.npmjs.org/*",
    "https://hackage.haskell.org/package/*",
    "https://pkg.julialang.org/",
    "http://pub.dartlang.org/api/packages/*",
    "https://crates.io/api/v1/crates/*",
    "https://rubygems.org/api/v1/gems/*",
    "https://packagist.org/packages/*",
    "https://jsonbin.org/fiatjaf/crystal/*",
    "activeTab",
    "webNavigation",
    "storage"
  ]
}