yeah i always get EXTREMELY paranoid whenever i'm shopping from usershops or taking a peek at someone's profile. even if i don't notice anything suspicious and the user seems to be a legit little newbie, i always clear my cookies and log out/log back in. it doesn't take very long and makes me feel safe. sorry about your 200k ):
This is really noobish and dumb but...
How do I clear my cookies?
in firefox i have to go to tools, then options, then privacy, and somewhere in the box that pops up there'll be a sentence that read "you might wish to clear out your recent history or delete specific cookies", so just click on that and then click on clear all if you're not sure.
(note that since i'm french i'm using the french version of firefox and the translation might not be totally accurate, but i think it should read more or less the same)