Integrated Color Picker&action=edit§ion=0
From FDT Documentation
With FDT 4, an integrated color picker was added to the editor. To invoke it, simply press Quick Assist (CMD+1) and FDT will show a color picker for you to work with.
With FDT 5, we've made some improvements on this: The first is is a tooltip pop-up that displays detailed color information and the second is a color history right in the proposal window.