Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

There are no error messages. I downloaded Firefox to my laptop and it does show up in my list of frequent websites, but every time I click on it I am taken to the Firefox download page instead of the Firefox browser.

Can't you open a new tab using Ctrl + T?

https://support.mozilla.org/en-US/kb/how-to-set-the-home-page

Type about:config<enter> in the address bar. If a warning screen comes up, press the I Accept the Risk button. At the top of the screen is a search bar. Type browser.startup.homepage

What is the value? Right-click and select Reset to restore its default value; about:home