Examine source code of Block3rd

{
  "manifest_version": 2,
  "name": "Block3rd",
  "description": "Block requests to 3rd party hosts. ",
  "version": "0.8",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "activeTab"
  ],
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_action": {
    "browser_style": false,
    "default_title": "Block3rd",
    "default_icon": "icon.svg",
    "default_popup": "popup/popup.html"
  }
}