Examine source code of WebTool

{
  "name": "WebTool",
  "version": "1.4",
  "manifest_version": 2,
  "description": "Web-page tools, increase user experience",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5fe19310-07c4-4ce9-8862-3c0eebfbe8e4}"
    }
  },
  "background": {
    "page": "background.html"
  },
  "icons": {
    "32": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "code.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      }
    }
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webNavigation",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "activeTab",
    "storage"
  ]
}