Examine source code of Hatch Native Messenger

{
  "name": "Hatch Native Messenger",
  "version": "0.3.2",
  "manifest_version": 2,
  "description": "Relays messages to/from the Hatch native printing service for the Evergreen ILS web client.",
  "icons": {
    "48": "icon_48.png",
    "96": "icon_96.png",
    "128": "icon_128.png"
  },
  "background": {
    "scripts": [
      "extension.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/eg/staff/*",
        "https://*/eg2/*/staff/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "Hatch",
    "default_icon": {
      "48": "icon_48.png",
      "96": "icon_96.png",
      "128": "icon_128.png"
    }
  },
  "permissions": [
    "nativeMessaging"
  ],
  "applications": {
    "gecko": {
      "id": "hatch-native-messenger@evergreen-ils.org",
      "strict_min_version": "50.0"
    }
  },
  "minimum_chrome_version": "38"
}