PopupPanel showRelativeTo Firefox issue

I have the following issue:
I'm using Google Web Toolkit SDK 2.1.1 2.1.1.v201012170127
and it looks like PopupPanel.showRelativeTo(textBox) in firefox 3.6.13
(also in firefox 3.0.13, tested only on these two versions)displays
the the popup panel 1 pixel to the left of the textBox(they are not
aligned, the difference is 1 pixel). Tracing absolute positions of
both widgets it looks like both getAbsoluteLeft() return the exact
same value which is weird - making a print screen and then zooming in
the image it's clear there is 1 pixel difference in the left position.
Opera, Chrome, IE display that same popup correctly left aligned to
the textBox.

I don't have any special css or layouts, it's just a hello world
example with an additional PopupPanel that uses the
showRelativeTo(widget) method.

Is this is a known issue? Is there any decent workaround for it?

Thanks

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