Force quitting firefox causes saved sessions to fail on next start

[kr094]

Force quitting firefox through windows shutdown causes the saved session to fail on next start. Tested with safe mode and exclusively with ublock enabled.

Steps to reproduce:

1. Open any URL in firefox (I tested with youtube.com)
2. Force quit firefox via task manager with "End Process Tree". This can also be a windows shutdown or logout
3. Restart firefox
4. Page showing "Whoops, this was embarrassing" and the previous session tabs are displayed

OS: Windows 7
Browser: Firefox 45.0.1
UBlock: 1.6.6 / Default filter settings

My rules:

no-popups: blank.about-scheme true
no-strict-blocking: blank.about-scheme true
no-strict-blocking: softonic.com true
no-strict-blocking: sourceforge.net true
behind-the-scene * 3p noop
behind-the-scene * 3p-frame noop

Temporary rules

no-popups: blank.about-scheme true
no-strict-blocking: blank.about-scheme true
no-strict-blocking: softonic.com true
no-strict-blocking: sourceforge.net true
behind-the-scene * 3p noop
behind-the-scene * 3p-frame noop

The blank.about rules might be the cause of this?

[gorhill]

How did you conclude this is a uBO's issue?

[kr094]

Enabling one add on at a time and re-trying my test case. I have 3 add ons:
uBO
Greasemonkey
Firebug

[gorhill]

You say

The blank.about-scheme rules might be the cause of this?

Did you try to answer your own question by trying to reproduce without these rules?

[kr094]

Yes, opening ublock on the new tab page doesn't allow me to enable/disable the power button.

[gorhill]

Alright, will do this: what you describe is a normal Firefox behavior, nothing to do with uBO. Re-open if and only if you explain very clearly what is actually wrong, along with supporting evidence that uBO is causing whatever you think is wrong.

[kr094]

I've managed to reproduce the issue already and confirmed it is with ublock. It does not happen in firefox safe mode. I've read your contributing doc and made sure to test this thoroughly

[kr094]

And it doesn't seem I can reopen github issues: isaacs/github#583

[gorhill]

You say:

Page showing "Whoops, this was embarrassing" and the previous session tabs are displayed

What are you reporting that you think is wrong? When Firefox crashes, this is actually exactly how it is supposed to behave.

[kr094]

But that behavior doesn't happen in safe mode. Nor did it happen months previously. Recently when starting firefox fresh this page is shown.

[kr094]

My apologies, Raymond. I resolved the issue by following the steps listed here. https://support.mozilla.org/en-US/questions/956252