Examine source code of SpellCheckAnywhere

{
  "author": "cisco211",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon-48.png"
    },
    "default_title": "SpellCheckAnywhere"
  },
  "description": "This extension allows you to make spellcheck work on whole page body.",
  "icons": {
    "48": "icon-48.png"
  },
  "manifest_version": 2,
  "name": "SpellCheckAnywhere",
  "permissions": [
    "file://*/",
    "http://*/",
    "https://*/"
  ],
  "version": "0.0.0.2"
}