Quoting from tanglu-devel mailing list:
"The Firefox we bake for Tanglu has had extended KDE support for a
while, meaning that it will integrate better with the KDE desktop by
using KDEs Open/Save dialogs and things like the "Select application"
This was a bit flaky until recently, everything seems to work really
well now. I therefore made the KDE support default on our Tanglu-KDE
flavor with the recent upload of tanglu-meta.
Please test if everything works, so we can ship Chromodoris with a