Installed Elementary OS recently, and I'm trying to make all the odds and ends tie up so everything looks smashing.

This is what happens when Firefox (with the "Elementary OS" persona installed) is maximised. My problems are, in order of importance:

1. I'm unable to find out how to replace the icons on the right with 7F7A7A-colour ones to match the theme.

2. That white line between the wingpanel and the browser window.

3. That either the clock on the wingpanel or the text on the browser window are not exactly centred and I want them to complement each other.

Does anybody have any suggestions for these?