Examine source code of Skip Sleeping Tabs Cycler

{
  "manifest_version": 2,
  "name": "Skip Sleeping Tabs Cycler",
  "version": "1.0",
  "description": "Cycle through only awake (non-sleeping) tabs using keyboard shortcuts.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "cycle-next": {
      "suggested_key": {
        "default": "Alt+Right"
      },
      "description": "Cycle to next awake tab"
    },
    "cycle-prev": {
      "suggested_key": {
        "default": "Alt+Left"
      },
      "description": "Cycle to previous awake tab"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "awake-tab-cycler@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}