Sidebar features like Arc

[benn44]

Is there a way to have a set of websites that are in the sidebar all the time? Im not talking about the big icon. I mean where the shyfox github site is in my arc screenshot. And under there are the normal websites that also disappear once you quit the browser.
I hope that makes sense
Thank you very much in advance

[astrahedron]

pin the tab, it should automatically reopen every time you close & reopen firefox i think