ive seen this in opera and decided it was opera acting funny and needing a fresh wipe.
I then began to see this error on my android browser,
i did notice it was this specific ad that kept doing this. and that it isnt from a trusted group.
t.mookie1.com
http://dm.de.mookie1.com/1/b3dm/exelate/1@x93
from verisign
serial
45:41:c9:1b:55:df:eb:dd:57:fc:63:1a:a6:86:32:e3
closing tab seems to fix em as its probably loading a different set of ads.