Differenza di allinemaneto tra Internet Explorer e Fire Fox: Come mai?

Questo è il codice:

<tr align="center" valign="middle">
<td height="30">
<input type="text" name="T1" size="25" value="inserisci la tua e-mail"> <font face="Arial" size="2">iscriviti!!! </font></td>
<td width="3" height="30"></td>
<td height="30">
<form method=post action=result.php>
Gruppo:
<select name=gruppo>
<option value=E321>E321
<option value=E322>E322
<option value=E323>E323
<option value=E402p>E402 Prototipo
<option value=E402a>E402a
<option value=E402b>E402b
<option value=E405>E405
<option value=E412>E412
<option value=E424s>E424
<option value=E424N>E424 Navetta
<option value=E428>E428
<option value=E444r>E444r
<option value=E453>E453
<option value=E464>E464
<option value=E623>E623
<option value=E626>E626
<option value=E632>E632
<option value=E633>E633
<option value=E636>E636
<option value=E645prima>E645 1° serie
<option value=E645seconda>E645 2° serie
<option value=E645.100>E645 serie 100
<option value=E645.300>E645 serie 300
<option value=E646>E646
<option value=E652>E652
<option value=E655>E655
<option value=E656>E656
<option value=Ale540>Ale540
<option value=Ale601>Ale601
<option value=Ale642>Ale642
<option value=Ale724>Ale724
<option value=Ale803>Ale803
<option value=Ale883>Ale883
<option value=minelett>Minuetto Elettrico
<option value=mindiesel>Minuetto Diesel
<option value=Taf>Taf
<option value=Eu43>Eu43
<option value=E640>E640
<option value=Es64>Es64
<option value=n208>208
<option value=n211>211
<option value=n214.1000>214 serie 1000
<option value=n214.4000>214 serie 4000
<option value=n216>216
<option value=n225.2100>225 serie 2100
<option value=n245>245 unificate
<option value=n245.0000>245 serie 0000
<option value=n245.2100>245 serie 2100
<option value=n245.6000>245 serie 6000
<option value=n255.2000>255 serie 2000
<option value=Aln668.1500>Aln668 serie 1500
<option value=Aln668.1700>Aln668 serie 1700
<option value=Aln668.1900>Aln668 serie 1900
<option value=Aln668galileo>Aln668 Galileo
<option value=Aln772>Aln772
<option value=Aln773>Aln773
<option value=Alndap>AlnDap
<option value=D143>D143
<option value=D145.1000>D145 serie 1000
<option value=D145.2000>D145 serie 2000
<option value=D146>D146
<option value=D341>D341
<option value=D342>D342
<option value=D343>D343
<option value=D345>D345
<option value=D443>D443
<option value=D445>D445
<option value=D753>D753
<option value=g2000>G2000
<option value=n625>625
<option value=n640>640
<option value=n685>685
<option value=n740>740
<option value=n741>741
<option value=n940>940
</select>
Unità:
<input type=text size=4 name="unità">
<input type=submit value=cerca>
</form> </td>
</tr>

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http://www.fotoditreni.com/index2.htm