I find the default Firefox behavior really annoying and this extension fixes it for me. I used to get this functionality as part of the Tab Mix Plus extension but unfortunately it doesn't work with newer versions of Firefox.

There seems to be a conflict with another extension that deals with tabs, the Unload Tabs extension (https://addons.mozilla.org/en-US/firefox/addon/unload-tabs/). With that extension enabled, this extension only works sporadically. If this extension doesn't work for you I would try disabling any other extensions that deal with tabs and see if that fixes the problem.

Original review: Doesn't work reliably under Firefox 77. Often the configured tab is briefly selected, then Firefox switches to the tab to the right of the closed tab. But I love the idea!