Does anyone like this?  I can't live without it but I've never heard any
comments or feedback about it.  I think it belongs in the base image.

Installing this SAR adds a preference under the "Browse" category called
"traceMessages".  When selected, MessageList browser profileration is reduced
by indenting implementors below and outdenting senders above in the same
browser, rather than opening a new browser each time.  Additionally, you can
very easily pare the list by multi-selecting (by click+drag or shift+click a
range) and pressing command+f (for remove From browser).

It's wonderfully non-intrusive, and now updated for 3.7.