Examine source code of Vue Performance Devtool

{
  "name": "Vue Performance Devtool",
  "version": "0.0.7resigned1",
  "description": "A devtool extension for inspecting the performance of Vue components.",
  "manifest_version": 2,
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16-gray.png",
      "48": "icons/48-gray.png",
      "128": "icons/128-gray.png"
    },
    "default_title": "Vue Performance"
  },
  "web_accessible_resources": [
    "devtools.html",
    "devtools-background.html",
    "build/backend.js"
  ],
  "devtools_page": "devtools-background.html",
  "background": {
    "scripts": [
      "build/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "file:///*",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "build/hook.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "build/detector.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{198b51a5-2441-4acd-9dee-ea033b8c9576}"
    }
  }
}