Examine source code of Tab Clear

{
  "manifest_version": 2,
  "name": "Tab Clear",
  "version": "1.3",
  "description": "Clears all tabs and leaves a new tab",
  "icons": {
    "50": "icon.png"
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      }
    }
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Tab Clear"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1fb2048d-5297-43aa-8cb2-429a61170b41}"
    }
  }
}