Examine source code of Broken Link Checker

{
  "manifest_version": 2,
  "version": "0.3.1",
  "name": "Broken Link Checker",
  "description": "A SEO tool to find broken (404) and redirected (301, 307, 308) links in all frames",
  "permissions": [
    "storage",
    "activeTab",
    "notifications",
    "contextMenus",
    "<all_urls>"
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "background": {
    "scripts": [
      "/v2/chrome.action.js",
      "/v2/chrome.contextMenus.create.js",
      "/v2/chrome.runtime.js",
      "/v2/chrome.scripting.js",
      "/v2/chrome.windows.create.js",
      "/v2/chrome.windows.get.js",
      "/v2/chrome.windows.getCurrent.js",
      "worker.js"
    ]
  },
  "homepage_url": "https://webextension.org/listing/broken-link-checker.html",
  "web_accessible_resources": [
    "data/popup/index.html"
  ],
  "commands": {
    "_execute_browser_action": {}
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{20c7ebef-9ce0-4130-8c4a-6c34009e11b1}"
    }
  }
}