Differences between native Mac OS X theme and MacOSX Theme on Linux

[zmichl]

Hello,

I am trying to place my extension's icon into an urlbar, but I am
experiencing visibility differences between native Mac OS X theme and
MacOSX Theme on Linux. There is a problem with urlbar's border that
behaves correctly on Linux, however on MacOSX fails.

Here are some screenshots:
http://www.pixhost.org/show/338/1050698_urlbar-linux.png
http://www.pixhost.org/show/338/1050699_urlbar-macosx.png

XUL overlay for my icon is following:
<textbox id="urlbar">
<box id="mybox1">
<hbox id="mybox2" ...>
<image id="myicon1" class="urlbar-icon"/>
</hbox>
</box>
</textbox>

I know I can place my icon into <hbox id="urlbar-icons"> that behaves
correctly on both platforms. But icon is on the right side of urlbar
in this case and I would like to have it one the left as is in
screenshots above.

Any suggestions how can I do it please?

Thanks