Icons in the sidebar are not in color any more

[darwin]

Paulo, you cannot really modify anything inside TotalFinder bundle because that breaks code signatures.

But you can follow this and specify a custom file:

How to specify custom sidebar icons?

I just checked the code and TotalFinder should be first looking at ~/.totalfinder-sidebar-icons.plist (in your home folder). Not sure if it still works. Please report back if it does not work for you.