Waterfox crashes constantly. It just vanishes... No "Our apologies.. Firefox crashed, upload the memory dump to developers?" window whatsoever.
I'm running BOINC in the background. Seti@Home uses my CPU, Collatz Conjecture uses my GPUs. I disabled GPU acceleration because it was negatively effecting Collatz Conjecture and helps Waterfox to run faster.
I also use a proxy VPN (Hotspot Shield).
Not being silly...but Waterfox may not like your overclock. I could run Prime95 for half a day, but then I'd open up a simply flash application or browse a web page and it would crash. I had to further stabilize my overclock before it would stop crashing. On people who have stock systems Waterfox runs fine, coming for first-hand experience (around 10 people I know use Waterfox) and they've had 0 problems so far.