Examine source code of Close Other Tabs Btn

{
  "name": "Close Other Tabs Button",
  "version": "0.2resigned1",
  "manifest_version": 2,
  "description": "Adds close other tabs button.",
  "icons": {
    "16": "close_others.png",
    "48": "close_others_48.png",
    "128": "close_others_128.png"
  },
  "browser_action": {
    "default_icon": "close_others.png",
    "default_title": "Close Others"
  },
  "background": {
    "scripts": [
      "close_others.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{10184973-9dc2-4485-8358-96c2dfc11bdc}"
    }
  }
}