Examine source code of Upnext

{
  "manifest_version": 2,
  "version": "7.8.4",
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "minimum_chrome_version": "68",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "./assets/icons/16x16.png",
    "48": "./assets/icons/48x48.png",
    "128": "./assets/icons/128x128.png"
  },
  "browser_action": {
    "default_title": "__MSG_appName__",
    "default_icon": {
      "32": "./assets/icons/browser-action/light-32.png",
      "64": "./assets/icons/browser-action/light-64.png",
      "128": "./assets/icons/browser-action/light-128.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src https://o363824.ingest.sentry.io https://*.googleapis.com https://*.sentry.io https://*.intercom.io wss://*.intercom.io https://api.segment.io https://*.segment.com 'self';",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "notifications",
    "tabs",
    "https://welcome.upnext.in/*",
    "https://*.googleapis.com/*",
    "https://*.sentry.io/*",
    "https://api.mixpanel.com/*"
  ],
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "externally_connectable": {
    "matches": [
      "*://*.getupnext.com/*",
      "*://*.upnext.in/*"
    ]
  },
  "web_accessible_resources": [
    "assets/fonts/*",
    "assets/video/*",
    "assets/images/*",
    "onboarding.html",
    "content.html",
    "messageConduit.html",
    "messageConduit.js"
  ],
  "optional_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2792747e-8201-45e8-8b96-cfc96610118d}"
    }
  }
}