When using https: I get double clicks sent to the server. This does not happen on older versions. It does not happen in http:...thank you

I have been tracking this problem for weeks. It is not a problem with Internet Explorer or Google Chrome. Temporary fix is to use these other browsers. We have multiple servers that run http with-out SSL. The problem never occurs with these. We also have Apache2 servers with mod-ssl running https: I thought it was a server problem or a Linux problem, but I can only duplicate the problem with Firefox. I down loaded 3.6.18 and the same problem. No other browsers seem affected.