Examine source code of Volume & Video Master 1000%

{
  "manifest_version": 2,
  "name": "Volume & Video Master 1000%",
  "description": "Volume & Video Master - Advanced audio and video controls for your browser",
  "version": "3.22.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "assets/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "volume-video-master@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "browser_action": {
    "default_title": "Volume & Video Master 1000%",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true,
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}