Custom Search Engine Creation

I've recently installed Bazzite (Fedora) on a Legion Go. I wanted to add my custom search engine to Firefox but I have no options for it. I have seen threads suggesting to just right click and add. Right click with a traditional mouse works but not in the search settings menu where I would add anything. Is this possible? (I did try to search Lemmy for this problem but didn't come back with any results). I'm still looking for a solution using different search engines but a lot of data is out of date.

Edit: I found a solution that works for me. I typed in the URL of my custom search engine and right clicked on it and had the option to add it as a custom search option. It then appeared in settings/search/default search engine in the drop down menu as an option. I can now hopefully set a shortcut etc.

I'm leaving this up in case anyone finds it useful.