Firefox 55.0.3 (64-bit) on FreeBSD-CURRENT.
For a session that had twelve windows, Firefox (PID 61241) attempted to restore twenty-three:
(Screenshots are available, but can not be uploaded at this time.)
Taborama is both experimental and not intended for use with Firefox 55.x, so I assumed a version mismatch issue and treated the incident as negligible.
Normally: my ‘everyday’ profile starts with one window (two tabs – one of which was pinned before quit, the second is
about:profiles (my home page)), then I use the Tools menu to present a Session Manager dialogue.
Abnormally: Firefox frequently starts with two windows.
The second window comprises the pinned tab that is also pinned in the first window. Screenshots available.
Has anyone else observed that problem?
I wonder whether it’s more likely to occur after quitting with more than eight hundred tabs.
Triplication of tabs
Just rarely, a Control-Click will open three adjacent tabs for the same URL. At first I suspected a hardware issue, maybe a failing mouse, but then I observed the issue with the notebook in a different environment (with a different mouse). Screenshots available.