Examine source code of CS Browser Helper JetB2

{
  "manifest_version": 2,
  "name": "CS Browser Helper JetB2",
  "description": "Helper for CS Ltd applications. It provides ability to directly print documents on working places, to work with digital signatures, various devices such as pos-terminals, card-readers, scanners, etc.",
  "version": "1.2",
  "author": "CS Ltd",
  "homepage_url": "https://www.csltd.com.ua",
  "permissions": [
    "<all_urls>",
    "cookies",
    "nativeMessaging",
    "tabs"
  ],
  "applications": {
    "gecko": {
      "id": "browser-helper-jetb2-adf@csltd.com.ua"
    }
  },
  "icons": {
    "48": "icons/bh-48.png",
    "72": "icons/bh-72.png",
    "96": "icons/bh-96.png",
    "144": "icons/bh-144.png",
    "192": "icons/bh-192.png"
  },
  "background": {
    "scripts": [
      "src/common.js",
      "src/browser-helper-port.js",
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/common.js",
        "src/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup/index.html"
  }
}