Javascript - Extremely Laggy Responsiveness Of LinkButton In FireFox

I have a little problem with a LinkButton in a UserControl based asp.net application. In Firefox, one single click on the LinkButton does not do anything. You have to press and hold the LinkButton for approx. 800ms to successfully trigger the PostBack.The Focus outline is lagging too. When i click on that LinkButton, the outline-change needs approximately the same amount of time you have to hold the button the trigger the postback. the webapplication and the LinkButtons are working perfectly in IE and Chrome the javascript libraries (external and internal) are currently neither obfuscated nor compressed Here's the asp.net markup:

<li id="liMemberGetPerson" runat="server" class="inactive clear">
<div class="tab clear">
<div class="tab-left"></div>
<div class="tab-main">
<asp:LinkButton ID="lbPersonArea" runat="server"
Text="Person" CausesValidation="false"
OnCommand="OnMemberViewAspectChange"
CommandArgument="MemberGetPerson" />
</div>
<div class="tab-right"></div>
</div>
</li>

Edit: the "code-behind":

protected void OnMemberViewAspectChange(Object sender, CommandEventArgs e){
AppAction currentAction = HistoryManagerFactory.GetCommandManager().GetCurrentCommand();
AppAction newAction = new AppAction();
newAction.ViewType = ViewType.MemberView;
newAction.AspectType = (AspectType)Enum.Parse(typeof(AspectType), e.CommandArgument.ToString());
newAction.ObjectID = currentAction.ObjectID;
newAction.Mode = currentAction.Mode;
HistoryManagerFactory.GetCommandManager().AddNewCommand(newAction);
ChangeAspect( newAction );}

The ChangeAspect() method call renders the corresponding View ( UserControl ). I have tried the following without success: Disable the Firefox Client Caching Disabling PartialPage Updates (disabling the UpdatePanels) If anyone has ever encountered this problem, i'd be very thankful to hear about any possible solutions.