*** Attention ***
A new fork of RadialContext has been developed in the latest months, which includes the fixes and features from RadialContext-D, but is based on a rewritten version of the code, plus it allows to customize your menues.
I have thus decided -not- to release an upgraded RadialContext-D for FF3, but I suggest to switch to RadialContext-MZ ( https://addons.mozilla.org/en-US/firefox/addon/5739
). It's better to have only one version of the same extension around :-)
***Update July 2013***
Another fork has appeared, see https://bitbucket.org/jmb/radialcontext-jmb
Replaces the standard context menu with a radial one.
RadialContext-D is a direct continuation of the RadialContext extension, fixing bugs and ensuring compatibility with newer versions of Firefox.
Requires Firefox 2.0+