Found this directory: carewolf@twilight% ls -l ~/.cache/plasmashell total 96 drwxrwxr-x 4 carewolf carewolf 4096 Mai 29 2017 attica drwxrwxr-x 4 carewolf carewolf 4096 Mai 29 2017 knewstuff drwxrwxr-x 2 carewolf carewolf 4096 Mai 29 2017 KRunner-Favicons-firefox-default drwxrwxr-x 2 carewolf carewolf 4096 Feb 8 16:15 'KRunner-Favicons-SELECT icon FROM icons WHERE url = :url LIMIT 1;' drwxrwxr-x 2 carewolf carewolf 77824 Apr 15 09:55 qmlcache I don't think SQL queries were meant to be in the file-system names. The creation date fits my 5.20.90 build, so it might already be fixed.
It appears it is also present in more recent versions. It has just moved to .cache/krunner
That is a compile time known string, but choosing the name of the browser will be better ;)
Git commit 094100187d72771b4992a40a499cbff2b770e9de by Alexander Lohnau. Committed on 29/04/2021 at 12:28. Pushed by alex into branch 'master'. bookmarksrunner: Choose less confusing folder name for cache FIXED-IN: 5.22 M +1 -1 runners/bookmarks/faviconfromblob.cpp https://invent.kde.org/plasma/plasma-workspace/commit/094100187d72771b4992a40a499cbff2b770e9de