You're less likely to pick somthing up under firefox but it is still possible and should not be taken for granted that its 100% safe. Nothing truely is.
If you google for your known problem with the word remove, with it your bound to find how to get rid of it for good
http://www.infopackets.com/channels/...structions.htm
thats the first result though i dont know the source so dont trust it as gospel