Examine source code of kyomail

{
  "manifest_version": 2,
  "name": "kyomail",
  "version": "1.1",
  "description": "Allows you to easily generate email aliases.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "js": [
        "kyomail.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js",
      "background2.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "kyomail"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs",
    "webRequest",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kyomail@xeny.uk"
    }
  }
}