Examine source code of Dicewareify

{
  "manifest_version": 2,
  "name": "Dicewareify",
  "version": "1.2",
  "description": "Presents the Diceware password table from passwordcreate.org",
  "icons": {
    "48": "icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon-48.png",
    "default_title": "Dicewareify",
    "default_popup": "dicewareify.html"
  },
  "applications": {
    "gecko": {
      "id": "firefox@dbej.net"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ]
    }
  ]
}