Hacker News Reader

Because when I close the one tab left, Firefox closes itself. Thanks to the fast launch time, I don't bother to keeping one open.

Note for anyone confused: this is not true on a Mac; in general it depends on what the OS's convention is.

Firefox doesn't do that on Windows either for me. I had to use a small extension by a friend to enable that.

browser.tabs.closeWindowWithLastTab = false should fix that.