It used to be more customisable but FF wanted to dictate what users saw, for some reason, partially advertising ("recommended by pocket"). They really like to imitate the worst of commercial enterprise sometimes.

It has become a little more customisable now, thankfully.

There should be addons that customize the new tab page. I’m pretty sure it’s a possibility with more recent additions to the webext api.

I don't know for sure in this case, but WebExtensions are normally forbidden in the browser's own pages.

To get around this limitation, one could set up a personal speed-dial start page.

they don't let you run in browser contexts normally but they definitely let you set your own new tab page(with webextension privileges) as part of the extension which lets an extension do whatever they want.

see: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

they also have most requested urls as a privilege too so it could be recreated and extended with a little effort.

Did you try Infinity Tab Pro (which is free)?

Sounds kinda similar to what you are looking. It does No. of sites, custom columns, custom pictures, and custom backgrounds. It really gives you a lot of control compared to all the other extensions I tried.

I'm going to check this out ! Thank you :D

It's way more than just pinning ! I organize my YouTube subscription in folders with themes like tutorials recipes and subfolders...you can do that on Firefox with the bookmark toolbar but in a less user friendly way and less visually pleasing way toi. what makes it worse is that it used to be possible on Firefox! It's not a deal breaker or anything ! But I miss that XD ! I had a hundreds of bookmarks organized on Vivaldi ! I still don't know how to "transition" that to firefox :/

You can set custom icon in FF. But yea, only rows not columns are customizable.