Examine source code of Accessibility Visualizer

{
  "manifest_version": 2,
  "name": "Accessibility Visualizer",
  "description": "Web accessibility visualizer browser extension",
  "version": "7.2.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png",
    "192": "icon/192.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon/16.png",
      "32": "icon/32.png",
      "48": "icon/48.png",
      "96": "icon/96.png",
      "128": "icon/128.png",
      "192": "icon/192.png"
    },
    "default_title": "Accessibility Visualizer",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "minimum_chrome_version": "89",
  "browser_specific_settings": {
    "gecko": {
      "id": "a11y-visualizer@ymrl.net"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "content-scripts/all-frames.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content-scripts/aria-notify.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}