View Single Post
Posts: 2,006 | Thanked: 3,351 times | Joined on Jun 2010 @ N900: Battery low. N950: torx 4 re-used once and fine; SIM port torn apart
#129
toolkit.screen.lock
entry in about:config
should do it

https://bugzilla.mozilla.org/show_bug.cgi?id=557642

But in my case it didn't work...

You can also try Ctrl+Shift+O.