938156 - [Session Restore] Shutdown Session Restore might deserve its own shutdown stage(s)

Status: NEW

(Firefox :: Session Restore, defect)

Description

[David Teller [:Yoric] - still alive but not very active]

At the moment, during shutdown, session restore takes place in two steps:
- at some unspecified point during quit-application-requested, it collects data;
- at some unspecified point during quit-application, it saves the data to disk;
- (just after quit-application, we close all windows).

We could insert an additional stage quit-application-saving-session after quit-application but before closing all windows, and perform both collection and saving during quit-application-saving-session.

This would be more flexible for add-ons (see bug 930713) and less messy.

Now, the performance (and other) implications are unclear.