Allowing Firefox tabs to autoshrink like ChromeEdit

Courtesy of "How to auto-shrink Firefox tabs like Chrome":

1. Go to about:config.
2. Search for browser.tabs.tabMinWidth.
3. Set to a smaller number, like 15.

As noted in that post:

It seems there’s a hardcoded minimum it won’t go below, so it’s not as ‘tight’ as Chrome, but it’s much better. Enjoy.

See also

• Forcing new Firefox tabs to open to the right of the current tab