I really dislike that you can no longer create a home page that opens on a new tab in firefox. You can still do that on mobile browsers, for example kiwi browser. I have a homepage [0] with large links for resources I frequently visit and I really miss having this as my home page on my computer.

[0] http://splet.4a.si/dir/home.shtml

In the about:config you should be able to add a custom url for new tab.

https://www.howtogeek.com/333805/how-to-change-or-customize-...

This site shows the steps. I tried it and mine is working. Firefox Developer Edition.