Symbionts is an extension that monitors and modifies the look of the
startup process. Symbionts displays the name and number of bytes of
memory each system extension allocates from the system heap. The name
and number appear beneath the extension's icon, and since the name is
usually truncated, Symbionts also displayes it in the menu bar.
Symbionts even shows the icons for those extensions that don't
normally reveal themselves.
First DL is version 2.8.6
Second DL is version 2.6.2
Third DL is version 2.4.3
Fourth DL is version 2.3.3
