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 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 web page or about: page you want.

You can modify your Firefox desktop shortcut with the two startup URLs. To try that:

• Desktop shortcut: right-click the icon, choose Properties
• Pinned taskbar icon: right-click the icon, right-click Mozilla Firefox, choose Properties

Windows normally will select the Shortcut tab. If not, go ahead and click the Shortcut tab.

You'll see the Target highlighted. On 64-bit Windows, that usually is no more and no less than the following:

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe"

To have the shortcut launch specific pages, you can add them to the end, for example:

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -url "http://www.dilbert.com/" -url "http://www.gocomics.com/pearlsbeforeswine"

After OK'ing the Properties dialog, you can test right away to confirm that Firefox now launches a window with those tabs. Either:

• double-click desktop shortcut
• right-click pinned taskbar icon, click Mozilla Firefox

Does that do what you want?

See also:

• https://developer.mozilla.org/Command_Line_Options