Examine source code of Streamulti

{
  "manifest_version": 2,
  "name": "Streamulti",
  "version": "1.0.0",
  "description": "Converts multiple twitch.tv tabs into a single multistre.am tab",
  "permissions": [
    "tabs",
    "tabHide"
  ],
  "background": {
    "scripts": [
      "button.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "/GlitchIcon_Purple_32px.png"
    },
    "default_title": "TwitchMulti - Collapse tabs"
  }
}