2 icons appear at dock when opening FireFox

When I open FirFox version 4.01b, 2 icons appears on my dock! When i close one of them, a message of flash crashing appear, then it reopening the icon by itself again.
== This happened ==
Every time Firefox opened
== After installing FireFox directly

That usually means that Windows notices that the program isn't responding.
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

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