Am afraid that's a very complex one, no idea if anyone can adapt soon :-/
For injecting styles manually the macros StyleonMini or StyleScriptia could be used, but doesn't work yet automatically by URL (if I recall correctly only in my unfinished follow-up version, but the configuration for users was rather complicated via editing kmm-files, probably too scary, then I was running out of time and have meanwhile most of it forgotten again - and still too little time :-/ )
(sig)
New unofficial K-Meleon 76.4 (KMG76.4) available, in own subforum.
Based on Goanna engine, called 'test' builds forever but more stable as 75.1 acc. forum members. It's 1-2 generations ahead of predecessor KM76RC-2016
K-Meleon FAQ (link missing in forum sidebar)
Tips&Tricks -
Learning new stuff every day
New to K-Meleon?
What do you like? What not?