Disable close of last tab in Firefox

Question

If I only have one tab open in Firefox and I close that tab Firefox exits.

How do I disable this behaviour?

A solution that prevents me to from closing the last tab or opens a new empty tab (or my homepage) is equally acceptable.

Answer 1

You could also add an extension like Tab Mix Plus.

Here's a screenshot of the config page. You can do one of two things:

1. Click the "Do not close window when closing last tab" option to open a new blank tab
2. Select the "Prevent last tab from closing"

Answer 2

there's an about:config tweak that should do this: browser.tabs.closeWindowWithLastTab set it to false.