Hi Peabody,
Those three things are probably related to the use of layers, but I don't think they're impossible to work around; for example, K-Meleon now retains the toolbar position between layers.
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adding close buttons to each "tab" indicator is not possible
I believe it's just not done in that way; you can middle-click or double-click a layer button to close the layer.
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drag-and-drop reordering of the tabs is not possible
Just FYI, there's
a bugtracker entry for this request, but with little activity.
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K-Meleon is not able to remember the Find criteria when moving from one tab/layer to another
Well actually this can be considered a feature, i.e. if you want to find different things in different layers, just like you can with different windows. What I don't know is whether this feature/bug was intentional.
Hope this helps.