Sometimes you accidentally lose a pinned tab because you unintentionally navigate to a different site without opening a new tab.

Tab Bag remembers the original pinned site, so you can quickly restore a pinned tab to its default

One annoyance with Chrome's pinned tabs is that they automatically launch when you start up your browser, eating up memory even if you don't open them.

Tab Bag lets you pin tabs as a lightweight placeholder that doesn't launch the pinned site until you click on it. 3/5

Here it is syncing pinned tabs across windows. It's not quite the same as how Arc Favorites live across spaces (each window has its own instance), but it at least provides quick access. You can toggle it on and off per window too. 2/5