How to make pages open in the same tab in Firefox?

[Will]

Instead of pages opening in a new tab, I want them to open in the same tab. This is what happened with my old computer but it isn't happening with my new one.

[Robert]

Hello, It's possible to make the Firefox read the URL that is used for the start-up page and go there when opening a new tab. but then if I change the URL in the options the new tab URL is not changed.

[Jazz]

Its in firefox settings under tabs

[Chris R]

In the toolbar go to Tools - Options, click on Tabs at the top. Here you can check or uncheck your options.