Examine source code of Online MBOX Viewer

{
  "manifest_version": 2,
  "name": "Online MBOX Viewer",
  "version": "2.0",
  "description": "Online MBOX Viewer to Open and view MBOX files, the ultimate online tool for hassle-free email preview.",
  "browser_action": {
    "default_icon": {
      "128": "img/icon-128x128.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "img/icon-128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cc519d8-31a3-45c9-9a70-eaeabef139b1}"
    }
  }
}