I believe like the homepage on Mobile Firefox (I use the Android version) could be improved in terms of shortcuts.
For example, I use the "Infinity Tab Pro" Add-On on the Desktop version of Firefox because I use the shortcuts on the homepage (i.e. new tab) to access the webpages I use most frequently. These webpages are different from my bookmarks.
On the other hand, when I use Firefox on my Android phone I get a different experience when using the homepage. There is no option to pin specific sites to "shortcuts" and every time I go to the homepage I am greeted with a different look of the homepage because webpages from my history are added as "shortcuts" and push away the sites I actually use the most. The only available solution to fix this is to manually "Delete from history" every webpage that shows up on the homepage.
I wish there would be some improvements to the homepage such as pinning webpages or custom shortcuts where we could add and organize webpages we use the most.
I attached an example screenshot of how my homepage looks like on my desktop Firefox just to help you visualize how I use Firefox.
Hope this goes somewhere.