I use CustomCSSforFx by Aris-t2 to heavily customize my FF GUI and installing Date and clock trashes my interface. I suspect Date and clock does it's clock magic with CSS which is why my GUI goes to heck when adding it. For many non-CSS tweaked users this is probably great but I have to use Clock by wwj whick works fine with a very CSS tweaked FF GUI.

Great idea, looks good, and is flexible but not suitable for my needs, as it disappears from view in fullscreen view. Would be good to have it on icon toolbar which is always displayed.Would be good to have option of date only or clock only.

Time / Date only setting would be nice, and at installation take over colors, etc. from browsersettings. later the user can change them.
I have weak eyes, so i have to keep my colors, contrast, etc.
I will give full stars, if it fits my needs. :-)