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about:newTab opens after I close the last tab instead of homepage

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I use SpeedDial extension, and it's set as my homepage. Also I change setting browser.tabs.closeWindowWithLastTab to false.

In Firefox 11, when I close the last tab, new tab with homepage (SpeedDial) opens, in Firefox Nightly new tab with about:newtab opens.

How can I change this behavior to act like Firefox 11?

I use SpeedDial extension, and it's set as my homepage. Also I change setting browser.tabs.closeWindowWithLastTab to false. In Firefox 11, when I close the last tab, new tab with homepage (SpeedDial) opens, in Firefox Nightly new tab with about:newtab opens. How can I change this behavior to act like Firefox 11?

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You can set the Boolean pref browser.newtabpage.enabled to false on the about:config page.

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I tried to set browser.newtabpage.enabled to false, it doesn't help.