What ddo you do about client-side decorations?

Hi long-time Openbox user here, I use it on my daily driver because I like its clean bloat-free approach and aesthetic.

I am getting increasingly frustrated with client-side decorations messing up the look. How do you cope with this, are there any ways to override this in programs that don't offer a native way to disable it?

Right now, I have to use "remote-viewer" and it is annoying the hell out of me, but it isn't the only culprit poisoning my desktop.