Treestyletab: Strange behavior with Firefox 64.0b1

[Zelman88]

I made a video that shows what's the problem since Firefox 64.0b1:
https://www.youtube.com/watch?v=ezUk1DFqe3M

As you could see sometimes the last tab disappears from tree style tab and I need to hide/show tree style tab to see it again. Sometimes the last tab doesn't respond for X button, I need to close it with right click menu.

[piroor]

This looks depending on a modified preference browser.tabs.closeWindowWithLastTab=false. It is true by default and the problem doesn't happen by default. Changing browser.tabs.closeWindowWithLastTab to true may become a workaround.

This doesn't happen on Firefox 63 beta, so something change on Nightly 64 may produce this problem.

[piroor]

This looks a bug of Firefox itself. When the last tab is closed both "tabs.onRemoved" and "tabs.onCreated" should be notified to TST, but in this case only "tabs.onRemoved" is notified. Moreover, this happens only on new windows tracked after TST is initialized. After TST is reloaded, both "tabs.onRemoved" and "tabs.onCreated" are notified when the last tab is closed in a window, because the window is "already opened" on TST is loaded. Hmm...

[piroor]

I've filed a bug at bugzilla.mozilla.org: 1500180 - Listener for "tabs.onCreated" is not called for a tab opened after the last tab is closed with "browser.tabs.closeWindowWithLastTab" = "false"

[piroor]

My patch has been marged and the bug will become fixed on Firefox 64 and later.

[Zelman88]

@piroor Firefox Dev edition updated today on my computer to 64.0b4 and now everything is back to normal with browser.tabs.closeWindowWithLastTab=false .