There is a strange problem with my web browser. Right now my computer using Firefox 12 as a default browser. The issue is whenever I bookmark any page, it changes my persona theme automatically and applies a different one which I have never downloaded or installed in that. This looks quite strange and seems like it is a default behavior of Firefox 12. I had the same problem with Firefox 11 but I have solved it. I donít know how and even I donít remember the steps. Same problem again appeared on this update. Do you have any solutions?