Examine source code of Tab Control

{
  "version": "1.1.3",
  "manifest_version": 2,
  "name": "Tab Control",
  "description": "Open tabs to the right, close to the left",
  "author": "czukowski",
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "commands": {
    "toggle": {
      "description": "Quick add-on toggle hotkey"
    }
  },
  "icons": {
    "512": "icon.svg"
  }
}