Examine source code of disable twitter sidebar

{
  "name": "disable twitter sidebar",
  "version": "1.0.0",
  "description": "well duh",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "notifications",
    "http://*/",
    "https://*/"
  ],
  "icons": {
    "48": "icons/twtr-side.png"
  },
  "browser_action": {
    "default_icon": "icons/twtr-side.png",
    "default_title": "disable twitter sidebar"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab86c74a-be0f-4ff0-a573-5e724b2b31f5}"
    }
  }
}