Examine source code of Keyboard Surfing

{
  "manifest_version": 2,
  "name": "Keyboard Surfing",
  "version": "1.3.21resigned1",
  "author": "Somnia",
  "description": "Web browsing with keyboard, no need to use a mouse. Smart cursor-based  keyboard navigation, laptop friendly. Go mouseless today!",
  "icons": {
    "32": "KSicon-20-032-1.png",
    "48": "KSicon-20-048-1.png",
    "64": "KSicon-20-064-1.png"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "csMerged.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": {
      "32": "KSicon-20-032-1.png",
      "48": "KSicon-20-048-1.png",
      "64": "KSicon-20-064-1.png"
    },
    "default_title": "Keyboard Surfing"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@keyboardsurfing"
    }
  }
}