Examine source code of pinteblock

{
  "manifest_version": 2,
  "name": "pinteblock",
  "description": "Replace #Ads with nice gradients from https://github.com/itmeo/webgradients #Pinterest",
  "homepage_url": "https://gitlab.com/AnthyG/pinteblock",
  "version": "1.0.6",
  "icons": {
    "32": "icons/x32.png",
    "64": "icons/x64.png",
    "128": "icons/x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.pinterest.com/*",
        "https://*.pinterest.at/*",
        "https://*.pinterest.ch/*",
        "https://*.pinterest.de/*",
        "https://*.pinterest.dk/*",
        "https://*.pinterest.ie/*",
        "https://*.pinterest.jp/*",
        "https://*.pinterest.kr/*",
        "https://*.pinterest.mx/*",
        "https://*.pinterest.pt/*",
        "https://*.pinterest.se/*",
        "https://*.pinterest.co.at/*",
        "https://*.pinterest.co.kr/*",
        "https://*.pinterest.co.uk/*",
        "https://*.pinterest.com.mx/*",
        "https://*.pinterest.ca/*",
        "https://*.pinterest.fr/*",
        "https://*.pinterest.com.au/*",
        "https://*.pinterest.nz/*",
        "https://*.pinterest.es/*",
        "https://*.pinterest.cl/*",
        "https://*.pinterest.ph/*",
        "https://*.pinterest.in/*",
        "https://*.pinterest.co.in/*",
        "https://*.pinterest.be/*",
        "https://*.pinterest.pe/*",
        "https://*.pinterest.co/*",
        "https://*.pinterest.com.py/*",
        "https://*.pinterest.com.bo/*",
        "https://*.pinterest.com.ec/*",
        "https://*.pinterest.ec/*",
        "https://*.pinterest.hu/*",
        "https://*.pinterest.com.vn/*",
        "https://*.pinterest.it/*",
        "https://*.pinterest.ru/*",
        "https://*.pinterest.com.pe/*",
        "https://*.pinterest.com.uy/*",
        "https://*.pinterest.co.nz/*",
        "https://*.pinterest.uk/*",
        "https://*.pinterest.vn/*",
        "https://*.pinterest.id/*",
        "https://*.pinterest.th/*",
        "https://*.pinterest.tw/*",
        "https://*.pinterest.nl/*"
      ],
      "js": [
        "sites/main.js",
        "sites/gradients.js",
        "sites/pinterest/content_script.js"
      ],
      "css": [
        "sites/pinterest/style.css",
        "webgradients/webgradients.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{626fe970-6e18-4910-bd1f-5a6bdf49854c}"
    }
  }
}