Examine source code of Jumble Solver

{
  "applications": {
    "gecko": {
      "id": "jumble@wordunscrambler.net"
    }
  },
  "name": "Jumble Solver",
  "short_name": "Jumble Solver",
  "version": "1.1.0",
  "description": "Solve The Daily Jumble word puzzles",
  "manifest_version": 2,
  "icons": {
    "32": "favicon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Jumble Solver"
  },
  "permissions": [
    "activeTab"
  ]
}