You can find browser tabs in KRunner, Plasma's document finder/app runner; send links from your browser to your phone with KDE Connect and control downloads started in your browser from your desktop.
For Chrome, Chromium, Vivaldi, etc.: https://chrome.google.com/webstore/detail/plasma-integration/cimiefiiaegbelhefglklhhakcgmhkai
mastodon.technology is shutting down by the end of 2022. Please migrate your data immediately. This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!