Strange horizontal menu problem with firefox on Mac

I recently implemented a website with Contao for a partner (www.medivas.de). All is well accept one thing: The last menu entry of the main navigation (top, above the slideshow) makes a line break. This is only with Firefox (3.6) on Macintosh, this does not happen on Linux (my development platform) nor on Ubuntu 8 and 10, nor on Windows and not with any other browser (IE, Chrome, Safari just to name the major ones). All is well so far. Problem is I can not reproduce this issue, I do not have a Mac, therefore I have to rely on other people.

Within the CSS defintion I tried to remove/changed/modified the padding (from padding:0 5px 8px 0; to padding: 0;) of the #nav-slide-wrapper div, because exact same problem with the line-break of the last menu entry happend with Chrome earlier in development phase. The padding is needed for the drop shadow image right and bottom of the slide show. Well, removing the padding leads to no success (my partner and another guy checked it with their firefox on mac, same issue, no change).

I have no clue, what to change, even though I can not test, like said, I own no mac.

So I would appreciate help from somebody, that has a Mac, has the firebug extension installed and has knowledge of HTML/CSS and could give me a hint how to fix this problem. Right now I am clueless, even that only the firefox on Mac seems to have this problem I am really at the end of ideas.

If more info is needed, if I forgot anything, please let me know.

Any help i开发者_Go百科s greatly appreciated!

Andreas

Using Max OSX 10.6.6 and Firefox 4b13, I don't report any line-break either.