Examine source code of Nur Text - Only Text

{
  "name": "See only Text",
  "version": "0.0.2",
  "manifest_version": 2,
  "description": "See only Text",
  "homepage_url": "http://hendrik-haas.de",
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "only-text"
  },
  "permissions": [
    "https://*/*",
    "http://*/*",
    "tabs"
  ]
}