Examine source code of Dev Environments

{
  "manifest_version": 2,
  "name": "Dev Environments",
  "short_name": "Dev Environments",
  "description": "Quickly run pre-configured, containerized development environments!",
  "version": "0.1.4",
  "icons": {
    "48": "icons/icon_devenvs.png",
    "96": "icons/icon_devenvs.png",
    "128": "icons/icon_devenvs.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*",
        "*://*.bitbucket.org/*",
        "*://*.gitlab.com/*"
      ],
      "js": [
        "dist/devEnvs.js"
      ],
      "css": [
        "css/style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{df83f1d2-79e8-4224-8251-40004a01faa8}"
    }
  }
}