the "power" button sometimes has no effect - when uB is disabled for a domain, it is not always actually disabled

this problem has existed in at least several of the later versions tested

in the following SS, 3 errors are displayed in the console for blocked resources (JS), yet uB is disabled for this domain...
http://s6.postimg.org/6jvqho8pt/screenshot_74.png

this problem is reproducible:
white-list (power button off) domain: 12bytes.org
close all tabs
load any website
in the same tab, enter the address 12bytes.org
result: uB is blocking JS resources from loading
if the tab is reloaded, all is fine

uB 0.9.3.1 and earlier
FF 36/37x
win 7