Examine source code of Blockchair - blockchain and crypto explorer

{
  "manifest_version": 2,
  "name": "Blockchair",
  "version": "2.1.20",
  "description": "Block explorer and anonymous crypto portfolio tracker for Bitcoin, Ethereum, and others in your browser",
  "omnibox": {
    "keyword": "b"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Blockchair",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/logo-block-16.png",
      "32": "images/logo-block-32.png",
      "64": "images/logo-block-64.png",
      "128": "images/logo-block-128.png",
      "256": "images/logo-block-256.png",
      "512": "images/logo-block-512.png",
      "1024": "images/logo-block-1024.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://blockchair.com/*",
        "https://whiskey.test/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end",
      "css": [
        "assets/content_style.css"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "https://blockchair.com/*",
        "https://whiskey.test/*"
      ],
      "js": [
        "content_script_blockchair.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "images/logo-block-16.png",
    "32": "images/logo-block-32.png",
    "64": "images/logo-block-64.png",
    "128": "images/logo-block-128.png",
    "256": "images/logo-block-256.png",
    "512": "images/logo-block-512.png",
    "1024": "images/logo-block-1024.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "contextMenus",
    "storage",
    "alarms",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8af03dd-4763-4dd5-96f6-d33b809753e1}"
    }
  }
}