Do not memoize all URI objects to the same key.
Do not memoize all URI objects to the same key.

Fixes #1874

the8472/greasemonkey,HasClass0/greasemonkey,HasClass0/greasemonkey,Ventero/greasemonkey,Ventero/greasemonkey,Martii/greasemonkey,the8472/greasemonkey,Martii/greasemonkey