The system info shown in the link on the right shows your user agent string as * Mozilla/5.0 (Windows; U; Windows NT 6.0; ru; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 WebMoney Advisor Other sites and applications are therefore identifying you as a Firefox 3 user. Judging by the name WebMoney Advisor has made that change, or you have downloaded Firefox from somewhere other than an official site. ( I had thought Firefox changes meant software could not easily modify the User Agent string now). Consider disabling or uninstalling any software associated with WebMoney Advisor. Do you recognise what that is ? There is a possibility it is malware, see for instance https://community.mcafee.com/thread/36852 See also [[is my firefox problem a result of malware]]

https://support.mozilla.com/en-US/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser

Thank you so much. You're right. Your link helped me to reset useragent. I'm happy.