How to rename shortcuts and edit their labels/images on New Tab page?

Hi everyone, I'm trying to customize the shortcuts on my Firefox New Tab page in ipad Air, but I can't figure out how to do a couple of things. I'd like to: 1. Rename a shortcut (change the text label that appears below the icon) 2. Change the icon/image of a shortcut First of all why can’t ipad version of Firefox can’t get my shorts cuts from my Firefox Sync? The icon of the shortcuts in ipad seems to auto-update based on the website's favicon — is there any way to manually set a custom image for a shortcut? Are there any about:config tweaks in ipad? I'm running the latest Firefox version on [Windows/macOS - sync enabled]. Thanks in advance for any help! Cheers