Preserve tabs in background thread instead of Main thread
Preserve tabs in background thread instead of Main thread

cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios