Waterfox seems to already have a default of 1000 microseconds, if... I think, you go with 'strict' privacy settings option?
So on the one hand, a very brief perusal of the paper shows that the method needs like, sub 200 timings to work well.
On the other hand... I have no idea if the exploit method effectively circumvents the way this timing speed limit actually works.
I basically just sped read everything lol.