Type about:preferences#general<enter> in the address bar.

There are two settings;

• When Firefox Starts

When the browser is started, what do you want to display? Many of us choose Show My Home Page.

• Home Page

When a new page is opened, what do you want to be displayed?

1. Use Current Page. Use what ever page(s) are open at that time.
2. Use Bookmark
3. Restore To Default. about:home shows a Mozilla home page with tools.

You can use any of these that you wish;

about:home (Firefox default home page), about:newtab (shows the sites most visited), about:blank (a blank page),

or you can enter any webpage or about: page you want.

There isn't a built-in way not to show your home page in a new window. The home page setting is used for all new windows. From the other perspective, there isn't a built-in setting to show a different set of pages at startup.

If you do not create a lot of new windows, one workaround is to use a bookmark. You can open the internal page named about:blank (type or paste that in the address bar and press Enter) and then drag the tab or the i-in-a-circle to the Bookmarks Toolbar. To launch a blank page in a new window, you can shift-click that bookmark.

If you launch a lot of new windows, another way is to modify the shortcut you use to start Firefox. You can add the addresses of the web pages you want to open at startup. Then you can set your home page to a blank page. These threads have the steps to modify the shortcut:

• Can you have a different action when you open your browser to when you click the home button in the browser?

• How do I open 2 websites on startup and 1 website when clicking the home button?