Examine source code of Jigsaw Desktop Sharing

{
  "name": "Jigsaw Desktop Sharing",
  "short_name": "JDS",
  "author": "JigsawInteractive",
  "version": "2.1.5resigned1",
  "manifest_version": 2,
  "minimum_chrome_version": "34",
  "description": "This browser extension enables Desktop Sharing for Jigsaw!",
  "homepage_url": "https://jigsawinteractive.com/",
  "permissions": [
    "nativeMessaging"
  ],
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "applications": {
    "gecko": {
      "id": "shareDesktopApp@jigsawme.com",
      "strict_min_version": "50.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "matches": [
        "https://*.jigsawinteractive.com/*",
        "http://127.0.0.1:4200/*"
      ]
    }
  ]
}