Firebug Lite has not been actively maintained or developed for some
time. There is simply no one to do it.
On Firefox itself, Firebug will soon longer work. It is not
compatible with the e10s multi-process model FF is shifting to, and
would require a ground up rewrite to work. The development resources
to do that don't exist. Attention has shifted the the built in Dev
Tools, with an open bug on the Firefox Bugzilla instance to list
things in Firebug and *not* in Dev Tools than should be added to Dev
Tools.
On Chrome, focus is on the corresponding Chrome Dev Tools. It used to
be possible to install Firebug Lite in Chrome, but I have no idea of
the current status.
Whether other browsers will support Firebug Lite at all is a "Try it and see".
Why do you specifically need Firebug Lite?
_____
Dennis
https://plus.google.com/u/0/105128793974319004519