Made a little progress .... but not enough (not that I understand completely why it works). Changed #column-content to: remove floating Position: absolute top: 10px left: -120px (that moved Explorer) Changed #content margin left: 120px (that moved Firefox back) Result was that the search bar didn't show in Firefox: Changed in Monobook.php: <div id="p-search" class="portlet"> in <div id="p-search" class="p-search"> and it was back again.

But 2 things remained: Most important: at some moment the tabs disappeared.....

And I can't get the footer positioned: relative of the length of the content; position: absolute or static, or relative does not heave any effect (and z-index doesn't work in Firefox). sigh..... even more desperate... Rein