Examine source code of Climate Block

{
  "manifest_version": 2,
  "name": "Climate Block",
  "version": "1.0.2",
  "description": "Murdoch press denies climate-change and manipulates our governments. This extension blocks all of their websites.",
  "author": "Rafael Schouten",
  "icons": {
    "16": "icons/favicon16.png",
    "32": "icons/favicon32.png",
    "48": "icons/favicon48.png",
    "96": "icons/favicon96.png",
    "128": "icons/favicon128.png"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "sites.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/favicon16.png",
      "32": "icons/favicon32.png",
      "48": "icons/favicon48.png",
      "96": "icons/favicon96.png",
      "128": "icons/favicon128.png"
    }
  },
  "web_accessible_resources": [
    "/blocked/blocked.html"
  ],
  "permissions": [
    "contextMenus",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ]
}