Examine source code of Shh gitlab

{
  "manifest_version": 2,
  "name": "Shh gitlab",
  "version": "1.1",
  "description": "Tells gitlab to be quite.",
  "content_scripts": [
    {
      "matches": [
        "*://gitlab.com/*"
      ],
      "js": [
        "shh-gitlab.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd8ee9c8-be6e-4c02-bc60-686b9e2feecc}"
    }
  }
}