How to get Full search functionality in "save file" dialog box in Firefox

[librewish]

Firefox - Support for native KDE file save dialog windows

How to add support for native KDE file save dialog windows in Firefox: If you prefer your applications to be consistent there is a way to make the GTK based Firefox browser display the proper Plasma file dialogs with KDE. It involves a bit of work, but it's not too complicated and I've provided detailed instructions below. If you have an older version of KDE Garuda installed you may not need to install the full list of required packages below. On the newer lighter versions of KDE Garuda you …

See if this is what you want