For some reason, I've always really enjoyed having a tiny non-persistent scratchpad in a browser tab. Just seems useful. This is despite having a clipboard tool, text editors, and a bunch of other tools available in KDE at all times.
This is an easy thing to accomplish, just copy the following into your address bar and hit enter:
data:text/html,<html style="background:rgb(000,333,666);padding:15px;><contenteditable><title>NOTEPAD</title><body><div style="text-align:center;"><textarea style="font-size:20px;width:90%;height:99%;padding:20px;border:10px solid black;border-radius:10px;font-family:monospace;"></textarea></div></body>
This works like any normal page, so you can bookmark the tab to have it available at all times.