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*this extension was made to fix bug #42894*
Rainbowpicker is a copy of the advanced colorpicker that can be found in Nvu and ported over to Firefox (and it should also work with Flock). I developed this with a hope that maybe other extension developers will use the colorpicker button in their extensions, namely the preferences/options windows. Since version 0.3, it also adds a toolbar button and a Tools menu option to bring it up to copy a color to the clipboard.
All it does is replace any button colorpicker elements with a different binding which displays the colorpicker dialog instead of the small 70-color pop-up.
It is purely binding intergrated using CSS, so developers can override it using their own CSS with an important priority.