Closing the last tab usually closes the browser window when browser.tabs.closeWindowWithLastTab is set to true (default value).

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Your message is confusing. If you do not know English well, please use your own language.

You want to close a tab or window, but it will not? What happens?

===================================

Please configure this tab (about:newtab) properly I see that it shows nothing. How long has this been going on?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac Options) key, and then starting Firefox. Is the problem still there?

=========================================

I would like to when closing the last tab was closed the application window or opened a home page that is specified in tinctures.

Sorry, what is "tinctures?"

Setting; browser.tabs.closeWindowWithLastTab = true Will close the browser when you close the last tab and window.

Type about:config<enter> in the address bar. If a warning screen comes up, press the Be Careful button. At the top of the screen is a search bar. Type the above in it.

Double click that entry to change it.

В Безопасном режиме тоже самое. Закладки сохранаяются как наподобии истории.

Sorry, but "сохранаяются" does not translate. What is the trouble?

Извините, но не переводить «сохранаяются». Что такое проблема?

Они возникают в свободных метах при неизвестоном условии. Срваните скриншоты.

I am sorry, but I can not get a good translation. Я извиняюсь, но я не могу получить хороший перевод.

1 Are you having problem with what the newtab page displays? 1 У Вас проблемы с тем, что дисплеи newtab страницы?

2 Are sites you visit not being displayed? 2 сайты вы посещаете не отображаются?

3 Is your history working properly? 3 Ваша история работает должным образом?

I will try to write differently, FredMcD. If you understood me, you enter words "I understood" in the beginning of message.

Problem: a bad work in tab "about:newtab".

Expected result: disabling (deactivation) of tab "about:newtab"; if the last tab is closed, the Firefox browser will be closed.

Details: the problem exists in Safe mode.

I understood

There is a setting that, when the last tab on the last window is closed, the browser will close. Is that what you want? Or not?

Do you want to change the newtab page to something else?

Hi, FredMcD. I remembered one important detail: a tab "about:newtab" worked instead of the tab "yafd:tabs" because addition "Yandex Elements" has been removed from the browser. But... I have one request. I recommend to improve the standard tabs in Firefox (about:newtab), i.e. to give users the ability to set bookmarks manually. You can find some information about this tab in the screenshot.

I am just a helper.

Hi,

The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues.

Are you trying to close both tabs that show in the screenshot?

When does a new about:newtab page open if that is what happens?

What is the current setting of the browser.tabs.closeWindowWithLastTab pref?

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Thank you, FredMcD.

Cor-el, the current setting of the browser.tabs.closeWindowWithLastTab have the setting is false. Do I must enter true in the string of value?

If this pref is set to false then you have a close X an the first tab if this is the only tab left (you have closed all other tabs). This allows to close all tabs and leave a tab with the new tab page. It the pref is set to true then closing the last tab will close Firefox automatically and on the next start the page is available via restore previous session or is restored automatically (Show my windows and tabs from last time).

Thanks, cor-el. The problem is solved.