@ra,
With the new beta we have the problem with new prefs which aren't known by K-Meleon.
A turn-around is to create a js file where you put the unknown prefs you need. This js file must be in defaults\pref folder
After, within K-Meleon these prefs can be modified.
Don't know if its exactly the same problem and if will work with 1.0.2 but try it, it perhaps will fix your problem.
A+
Mozilla/5.0 (x11; U; Linux x86_64; fr-FR; rv:38.0) Gecko/20100101 Ubuntu/12.04 K-Meleon/76.0
Web:
http://jujuland.pagesperso-orange.fr/
Mail : alain [dot] aupeix [at] wanadoo [dot] fr
Ubuntu 12.04 - Gramps 3.4.9 - Harbour 3.2.0 - Hwgui 2.20-3 - K-Meleon 76.0 rc