Examine source code of NERBlock

{
  "name": "NERBlock",
  "version": "1.2.6.3",
  "manifest_version": 2,
  "author": "nerblock",
  "description": "A Nemzeti Együttműködés Rendszerének (NER) propagandáját terjesztő weboldalak blokkolásához.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "nerblock-options.html"
  },
  "background": {
    "scripts": [
      "nerblock.js",
      "nerblock-urls.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "nerblock-pageblocked.html",
    "nerblock-embedblocked.html"
  ],
  "browser_action": {
    "default_title": "NERBlock",
    "default_popup": "nerblock-popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "19": "images/icon19.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png",
      "38": "images/icon38.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "19": "images/icon19.png",
    "24": "images/icon24.png",
    "32": "images/icon32.png",
    "38": "images/icon38.png",
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a8a9ddd-ec0a-4a6c-a1cf-44d994c1b08e}"
    }
  }
}