Was just filing the same question when I saw this one.
For me goes the same.
I want to use K-Meleon on a system with 3 monitors added to it. However, when I use f11 to go fullscreen, K-Meleon always flees back to the primairy monitor, even when the non-maximised window fully resides on monitor 2 or 3.
I can reproduce this on my laptop, with 2 displays attached via displayadapter cables.
Forum:
Bugs