Instead of installing an add-on you can Rated 5 out of 5 stars

1. Go to about:config

2. Change preference browser.tabs.closeWindowWithLastTab to false.

Rated 5 out of 5 stars

Great extension. I wanted to just show a page of dials when I close the last tab for a long time. Saw this extension and now I am happier. This is what makes Firefox great.

Rated 3 out of 5 stars

Does not work with tab groups: opens tab groups window when last tab is closed irrespectively of the setting

Can't believe I need an add-on for this Rated 5 out of 5 stars

Finally helped me move out of Opera to Firefox.

Won't you please give us the option for Close button behavior: Blank Page Rated 4 out of 5 stars

We don't want to close Firefox, just close all Tabs and have a blank page be there instead of little snapshots of pages last visited. Blank Page option please.

Great if you're used to IE Rated 4 out of 5 stars

At first, like other posters, I thought this didn't work. The expected behaviour is that pressing the tab close button on the last tab will close the whole window, like it does in Internet Explorer. But then I figured it out.

First, go into the Add-ons Manager and open the plug-in's options. Click the radio button that says "Close window". Clicking the close button on the last tab still won't close the window, but DOUBLE-CLICKING it will.

That works for me. I can get used to that. Four stars because the single-click like it's supposed to does not work (on FireFox 26.0).

Doesn't Work As I Hoped Rated 2 out of 5 stars

I expected this to work similar to what chromium/chrome has where pressing the "x" would actually close the program too. However, even with the custom options in the preferences, pressing the close button only refreshes to the "new tab" page.

While this does technically add a close button to the last tab, it's behavior really isn't useful.

Rated 5 out of 5 stars

Замечательное дополнение.
Заменило мне исправление в конфиге, которое не корректно работало в 24+ версиях.

Great extension, but doesn't fully work for private windows Rated 5 out of 5 stars

This extension is great for normal browsing, but the close window option does not work for private windows. Can this be fixed?

Rated 1 out of 5 stars

неправильно работает с бэта 24

Best plugin there is. Rated 5 out of 5 stars

A great execution of a simple plugin that should have been built into frigg'n Firefox since 23 builds ago. THANK YOU.

Close Window Problem Rated 4 out of 5 stars

Works fine with all options except the close window option. In close window once i shutdown firefox, it wont restart. It flashes for a second then closes. Please help. Great addon btw, nice work.

Rated 5 out of 5 stars

it works for me and does exactly what i wanted - very simple :)

Firefox won't open again Rated 1 out of 5 stars

After I install the add-on, I'm prompted to restart firefox. I manage to do that, but afterwards, if I close firefox, I'm not able to open it again. It flashes for a second and then closes. I disable the add-on from safe mode and then I can use firefox again. Any ideas?

Rated 5 out of 5 stars

To 冶心道长.

I Suppose the new feature of FF13 (about:newtab) caused this failure.

Go to about:config
find browser.newtab.url ;about:newtab and change it to about:blank.

And there will be no about:newtab anymore.

Sorry for my english!

Having Problem with Version 0.3.6 //Using Firefox 13.0 Rated 5 out of 5 stars

It opens about:newtab however configured.
Now using Firefox 13.0 (Simplified Chinese). This Addon worked just fine under FF12.
I Suppose the new feature of FF13 (about:newtab) caused this failure.
Or, Does the UI-language matter? Unbelievable.

This review is for a previous version of the add-on (0.3.6.1-signed.1-signed). 

RE: Having Problem with Version 0.3.6 Using Firefox 13.0

The new version 0.3.7 improves compatibility with Firefox 13. She is waiting for approval.

Having problems with version 0.3.5 of this addon Rated 5 out of 5 stars

If Firefox is set via about:config to: "browser.tabs.closeWindowWithLastTab" False, then after installing this addon and restarting Firefox, the page will then continually reload.
If I reset "browser.tabs.closeWindowWithLastTab" to True, then this behavior stops, but I don't want it set to True, so I have gone back to using version 0.3.4.
Opening the Add-ons tab via Firefox Tools/Add-ons, while about:config "browser.tabs.closeWindowWithLastTab" is set to False, should be enough to duplicate the page reload problem, if not try clicking on the last tab close button, then maximizing the Add-ons tab again.
Also setting the page to open about:home gives an invalid page error and opens nothing.
*[Using Firefox 3.6.28]* and sticking with it, as this old PC can't run the latest versions of Firefox.

*I won't down rate this Add-on because the old version works just fine and it has been very useful to me.

This review is for a previous version of the add-on (0.3.5.1-signed.1-signed). 

Rated 5 out of 5 stars

actually aftes some research i have to say that it seems to be obsolete now as it is enough to set browser.newtab.url & browser.tabs.closeWindowWithLastTab your way...

but it will be missed ;)

This review is for a previous version of the add-on (0.3.4.1-signed.1-signed).  This user has a previous review of this add-on.

Rated 5 out of 5 stars

A must have add on for frequent browsers.

This review is for a previous version of the add-on (0.3.4.1-signed.1-signed). 

Rated 5 out of 5 stars

Thanks for adding "open about:home page in last tab" feature [ Update : May10 - 2012 ]
As Commented by Drawken on March 24 , 2011 ,
Pls change focus of cursor to google search field when it opens about:home page

Manual Trick : i found that by setting "browser.tabs.closeWindowWithLastTab" value to FALSE ,
firefox last tab displays close button on last tab , also onclose , instead of closing the window ,
it displays about:blank tab

This review is for a previous version of the add-on (0.3.4.1-signed.1-signed).