Examine source code of Virtual Keyboard Launcher

{
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "hvkeyboard.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Automatically brings up the virtual keyboard when entering text input fields. Requires Hot Virtual Keyboard software to be installed and running",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "256": "icon256.png"
  },
  "name": "Virtual Keyboard Launcher",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "file:///*"
  ],
  "version": "4.2",
  "author": "Comfort Software Group",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfa83375-6f2d-43d0-8856-203d8934bbc9}"
    }
  }
}