Falkon browser -- PDF -- helper apps

Hi guys, first post here. I got the Falkon browser as part of an overdue Linux distro upgrade a couple of days ago and am generally pleased with it – the removal of ads is a huge benefit. I have a simple problem which I assumed I’d be able to fix in 30 seconds, but it has so far defeated both the Falkon help pages and DuckDuckGo. (It has an odd Netscape/1993 aspect – sorry if anyone is groaning and rolling their eyes.)

Falkon seems to use the old-fashioned “helper app” concept, and my copy sends the PDFs it encounters to Gimp, probably my least-favourite graphics app of all time.

I can of course download the files, launch Okular and print them off, but it would be much better if I could instruct Falkon to use Okular as its helper. I looked in the Downloads manager and some other spots in Preferences, but Falkon’s developers don’t think the way I do.