problem with firefox back button in site

my problem is that only with firefox, when a visitor click to see/read, via the more link option, a new item and then wants to come back in home page with the back button of firefox, he/she must click it three – four times to go back. first i noticed that these happens only with the more link option, for example mysite.com/p=23132#more-23132, but then i notice that these also happens (not so often) and with mysite.com/p=23132 also. so, i thought that is something most complicated. any suggestions? it happens only with firefox, and its a little annoying to click 3-4 times to go back, if you use the back button of the firefox. can someone help me? where i must search the problem? please help me