Examine source code of Solvem Probler

{
  "manifest_version": 2,
  "name": "Solvem Probler",
  "description": "Algebraic Problem Solver",
  "version": "2.1",
  "action": {
    "default_popup": "index.html",
    "default_icon": "spicon.png"
  },
  "host_permissions": [
    "*://deltamath.com/*",
    "moz-extension://01a9aeca-e8a4-401d-b303-2f43650d43e3/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{01a9aeca-e8a4-401d-b303-2f43650d43e3}"
    }
  }
}