[abdullahkhalids]

I can only close tabs with Ctrl+W. Clicking on the 'x' button does nothing.

[sfink]

Something's weird, then, given the number of Mozilla devs who use TST. Try in safe mode / try in a different profile / file a bug.

(I am running Nightly and am happily clicking away TST tabs with the 'x'.)

[abdullahkhalids]

Thanks. Reinstalling the extension fixed it.

[mkl]

Did that lose your existing tree structure and flatten everything?

[abdullahkhalids]

Nope. I did the following steps: (1) uninstall TST (2) restart browser (3) install TST (4) restart browser.

All the tabs were as is. But I also purposefully did not open or close any tabs between (2) and (3). Not sure what the impact of that would be.