I am about to finish my Mozilla Firefox 3 beta 3 addon and I'm stuck on one thing, how do I set the icon in optional components wizard?

Its better to not have a icon there in the 1st place, If you use HIDE in your sysoc section of your entries_*.ini and it is still showing up that is probably because you are using indifferent names for your sysoc.inf entry and your INF example (notice where it says "Same Name Here")

Entries_*.ini:

[sysoc]

Same Name Here=ocgen.dll,OcEntry,InfFile.inf,HIDE,7

InfFile.inf:

[Optional Components]
Same Name Here

[Same Name Here]
OptionDesc  ="Program Name"
Tip		 ="Program Description."
Modes	   =0,1,2,3
CopyFiles  =etc, etc

BTW the icons you see in Add/Rem Windows Components are not actually icons they are BMP's and you can find them in the DLL's of the "%WinDi%\system32\Setup" folder

I've just figured out how to change them by looking in some of the infs in the inf folder. I actually prefer to show the icon but thanks for the tip.

Yea IMO its best to hide it because you cant really uninstall if from add rem comp.

I am planning on making a kind of tutorial on how to best use the Add/Rem Components to uninstall INF addons (I have a trick to use UnRegisterDLLs to close a program)