Examine source code of Bernie PB

{
  "name": "Bernie PB",
  "version": "1.0.24",
  "description": "Updates your BerniePB call stats as you use the Bernie dialer.",
  "browser_action": {
    "default_icon": "icon_v2_250.png",
    "default_popup": "popup.html",
    "default_title": "Bernie PB",
    "browser_style": false
  },
  "icons": {
    "16": "icon_v2_16.png",
    "48": "icon_v2_48.png",
    "128": "icon_v2_128.png"
  },
  "permissions": [
    "cookies",
    "https://www.berniepb.com/",
    "storage"
  ],
  "background": {
    "scripts": [
      "jquery-3.3.1.min.js",
      "common.js",
      "background.js",
      "bg_locale_fetch.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "jquery-3.3.1.min.js",
        "common.js",
        "content_script.js"
      ],
      "matches": [
        "*://*.openvpb.com/*",
        "*://www.berniepb.com/*",
        "*://*.livevox.com/*",
        "*://*.callhub.io/*"
      ]
    }
  ],
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "BernieCallTracker@berniepb.com"
    }
  }
}