Hi Moonchild, I'v been using Pale Moon (Portable version) for a long time now and I love it, congratz for your awesome work there.
I stumbled upon this addon today, and as a geek, I obviously loved it :]
I'm used to change/tweak via about:config some of PM/FF internals and I'm here to submit one (maybe more later) to be made accessible thru your addon :
(Needles to say that Pale Moon being performance oriented, my current suggestion and futures ones are related to performance and responsiveness enhancement)
nglayout.initialpaint.delay = 150 (default)
Delay in ms before the page start to be drawn, to let more content (like images/css) to be loaded before the 1st draw, content loaded later will trigger a redraw of the HTML and cause more CPU cycles. If all content is loaded the page is drawn immediately.
A tricky value to tweak, but I like to have it quite high (1500 ms) on my low-perf netbook, because I know that very few page load faster. (the Wifi being another bottleneck)
On my High end desktop I set to to 0 or 1 to have maximum responsiveness.