Examine source code of Kowatsu Live

{
  "manifest_version": 2,
  "name": "Kowatsu Twitch",
  "version": "2.1resigned1",
  "description": "pour ne plus rater mes lives installer cette extension",
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "64": "img/green.png"
  },
  "background": {
    "scripts": [
      "jquery.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05bce07c-0bf2-443d-80c6-e2ee9f58d9fc}"
    }
  }
}