1450858 - Lost all open tabs of some windows when restoring tabs after reopening browser

Status: RESOLVED INCOMPLETE

(Firefox :: Session Restore, defect)

Description

[Richard]

User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20180323154952

Steps to reproduce:

I had 9 Firefox windows opened, each with multiple tabs.
Firefox was unable to fully restore all windows each with the last tab selected.
The browser was in consuming processor cycles and tcp connections, but was unable to restore them (the problematic windows, 2 of 9, had tabs without any title or any content, just a loading circle cycling in the middle).
After 15 minutes I closed the browser (it couldn't finish its last process, which hogged around 2 minutes with ~500MB of Ram, and then it crashed showing the firefox crash report app).
Then, after restarting the browser, the tabs in the problematic windows vanished entirely, with each of these windows showing just a blank tab.


Actual results:

Lost all tabs in the 2 windows that couldn't be restored.


Expected results:

Neither window should be corrupted.

Comment 1

[Adrian Florinescu [:aflorinescu]]

From the report details, this seems on the same lines as bug 1448309. 
Richard, by any chance, did you manage to reproduce this issue more than once? More on the lines, can you isolate steps to reproduce this issue?

Comment 2

[Justin Dolske [:Dolske]]

Not enough info here to reproduce or diagnose.