Increase root font

manifest.json

{
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Increase root font"
  },
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com; img-src *; object-src 'self'",
  "description": "Increases the html font size in % ",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "manifest_version": 2,
  "name": "Increase root font",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "update_url": "http://clients2.google.com/service/update2/crx",
  "version": "1.1"
}