Selection set incorrectly when closing active tabs opened from pinned tabs when appending to the end of the tree

[awused]

Short description

The behaviour when closing closing tabs opened from pinned tabs is incorrect when using the

Steps to reproduce

1. Start Firefox with clean profile.
2. Install TST.
3. Set tabs opened from pinned tabs to "Append to the end of the tree".
4. Open a tab and pin it.
5. Open another tab with the new tab button.
6. Open a new tab from inside the pinned tab and select it.

Structure is now:
A (pinned)
B
C (selected, opened from A)

7. Close tab C

Expected result

Tab B should be selected.

Actual result

Tab A is selected.

Opening a new tab while C is selected, either with the new tab button or from inside C, will fix the behaviour even if that fourth tab is immediately closed.

Environment

• Platform (OS): Windows 10 x64
• Version of Firefox: 57.0 (64-bit)
• Version (or revision) of Tree Style Tab: 2.2.9

[awused]

Never mind, this is caused by browser.tabs.selectOwnerOnClose. I'd love to see an option to disable this from inside TST or at least a warning about it causing confusing behaviour.