Examine source code of TabWrangler Bridge

{
  "manifest_version": 2,
  "name": "TabWrangler Bridge",
  "version": "1.0.32",
  "description": "Communicates with the native TabWrangler plugin shim.",
  "permissions": [
    "nativeMessaging",
    "tabs",
    "tabGroups",
    "contextualIdentities",
    "storage",
    "notifications",
    "cookies",
    "http://localhost:54234/"
  ],
  "background": {
    "scripts": [
      "shared/shared.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "TabWrangler"
  },
  "icons": {
    "16": "shared/icon-16.png",
    "32": "shared/icon-32.png",
    "48": "shared/icon-48.png",
    "64": "shared/icon-64.png",
    "128": "shared/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabwrangler@bill.z.bawb.com"
    }
  },
  "options_ui": {
    "page": "shared/options.html",
    "open_in_tab": false
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxsRtAiTxL+ilMQjwdizyMHNQKlMeWRnPNeEaLgbnl/yuyReMCwJXThRhe1isQMR1HwHSuK4u95RWCvflNDH5cLS8Q2n4yjAw7ZoU2hVHOxoEjqS+TKOU0Mbi1muRNYeYLVuGfy4fbIAb1A6mhtMDeUT+6YHY1GZwFNJG4YGgS3X4hzgyZ8nlixKMiDGOT52v3ynx60qSRcjKYJ0MAVXJryW78jcEqFD2Nl5T9BAIZzddz8LDXOk1m6+ISsckFFRHLHBLN1ZdHU24JsoZprer8Xh6jQeDAL9qNSGKR8v3AQL7e2zGDjdcGdEGeSCBqLkCqqoh/4sieTTYhiYfT2RkPQIDAQAB"
}