The Snapshot browser is much like the standard Smalltalk System Browser except that it displays the contents of a Snapshot, rather than the code that is active in the image. Since Snapshots are immutable, the Snapshot browser does not allow editiing.
One difference between the Snapshot Browser and the familiar system browsers
is that the Snapshot browser uses the special system category *Extensions to
categorize classes that do not belong to the package, but which have extension
methods that do.