Examine source code of block a lot website

{
  "manifest_version": 2,
  "name": "block-a-lot-website",
  "description": "block a lot website. filter it from search result",
  "version": "0.0.1.5",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "block-a-lot-website@example.com"
    }
  },
  "icons": {
    "48": "icons/48.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "scripting",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "contextMenus",
    "storage",
    "unlimitedStorage"
  ],
  "browser_action": {
    "default_icon": "icons/48.png",
    "default_title": "block website manage",
    "default_popup": "index.html"
  },
  "page_action": {
    "default_icon": "icons/48.png",
    "default_title": "block this website",
    "show_matches": [
      "<all_urls>"
    ]
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": []
}