Examine source code of Video Speed Persistent

{
  "name": "Video Speed Controller",
  "description": "Change speed of all videos on page.",
  "version": "1.0.6",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "video-speed-controller-fork@norm.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "utils.js",
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Q",
        "mac": "Alt+V"
      },
      "description": "Start the extension"
    },
    "toggle-speed": {
      "suggested_key": {
        "default": "Alt+Shift+Q",
        "mac": "Alt+S"
      },
      "description": "Use Alternate Video Speed"
    },
    "increase-speed": {
      "suggested_key": {
        "default": "Alt+Up",
        "mac": "Alt+Up"
      },
      "description": "Increase video speed"
    },
    "decrease-speed": {
      "suggested_key": {
        "default": "Alt+Down",
        "mac": "Alt+Down"
      },
      "description": "Decrease video speed"
    }
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "storage",
    "scripting"
  ]
}