By default, you can edit the existing icon that is currently showing on your FireFox Homepage. Step 1: click into the open menu function on the icon( the 3 dots) edit :https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-06-15-20-12-15-0e0619.png Step 2: click on edit, then you can paste the url/link you want into the existing one to change it. url/link:https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-06-15-20-13-38-b2b3b2.png If you want to add new icon Step 1: click on the setting button which is on your top right corner at your homepage. Setting button: https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-06-15-20-06-24-8a68ec.png Step 2: once you clicked on it you should be able to see a shortcut that has the option that allow you to choose how many row you want. Shortcut:https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-06-15-20-10-47-6d00fc.png

I don't use a home page but this article may help. https://support.mozilla.org/en-US/kb/how-to-set-the-home-page