Due to difference in liveconnect/javascript implementation across different browsers some of the things do not work as expected and as a result users can get different results across different browsers. For example newly introduced DeploymentToolkit API jvms.getLength when called inside an applet will return an "int" value inside the IE while on mozilla/forefox it will return "double" value. I think we should document all such behaviors inside our liveconnect/scripting docs to make the implementation easier for the end users. For details please refer to following bugs which can explain a bit the problems faced by users while doing liveconnect implementation due this inconsistency:
6293773, 4651777