> -moz-inline-box
>
> is it equal to inline-block or some difference?
No. It doesn't work without width.
Use of display:table;display:inline works sometimes just like
display:inline-table
> what oldest Gecko browser recognize it?
Don't know. IIRC, there is differences between versions, at least before
FF1.0
> do I need to use it in FF 1.5 ?
No.
> Full disclosure: I'm adjusting my SELECT widget based on textfield +
> drop-down link menu. So instead of <option> I have <a
> href="something.html" class="option"> and inline-block is very handy
> there.
Might work, if you use width. But usually, if you can use float instead,
use it.

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Lauri Raittila <http://www.iki.fi/lr> <http://www.iki.fi/zwak/fonts>