Examine source code of Video Frame Grid

{
  "manifest_version": 3,
  "name": "Video Frame Grid",
  "version": "1.2.1",
  "description": "Generate a visual contact sheet / frame grid from any video on a webpage. Click the icon to enable, then videos auto-generate a grid.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8f1c5a0-7b3d-4f2e-9a6b-1d0c8e5f4a3b}",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon16-disabled.png",
    "48": "icons/icon48-disabled.png",
    "128": "icons/icon128-disabled.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16-disabled.png",
      "48": "icons/icon48-disabled.png",
      "128": "icons/icon128-disabled.png"
    },
    "default_title": "Video Frame Grid"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "commands": {
    "trigger-grid": {
      "suggested_key": {
        "default": "Alt+G"
      },
      "description": "Generate the frame grid for the current video"
    }
  }
}