How to trick website that im using firefox not ie

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I was trying these user agents but i always get errors so im asking for some help/advice.

$oIE = _IECreateEmbedded ()
$GUIActiveX = GUICtrlCreateObj($oIE, 160, 0, 467, 601)
$oIE.SetRequestHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; InfoPath.1)")
_IENavigate($oIE, "http://whatsmyuseragent.com/")

Hmmm it shows to this website but it wont trick other websites. Whats wrong? How to make it more powerfull?

Edit: Everything is ok. It works. Only website dont supports ie lol

Edited June 20, 2012 by Edgaras

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Ok, now I want to change ie to opera mini. I changed settings in regedit for opera. Before changing setting my user agent was mozzila (even i used ie embeded in gui) now when i changed settings i get this

Mozilla/4.0 (compatible; Opera/9.80 (J2ME/MIDP; Opera Mini/4.2.20464/28.1857; U; lt) Presto/2.8.119 Version/11.10; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; Media Center PC 4.0; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E)

I need to show only that string.

Opera Mini/4.2.20464/28.1857; U; lt) Presto/2.8.119 Version/11.10

I managed to change it to

Opera/9.80 (J2ME/MIDP; Opera Mini/4.2.20464/28.1857; Presto/2.8.119 Version/11.10; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; Media Center PC 4.0; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E)

But cant get rid of that Mozzila things. And why they are there when im using ie?

Edited June 21, 2012 by Edgaras