Pinned tabs should be pinned across all windows
Problem
Pinned tabs are only pinned in one window. If the user opens another window and close the first one, their pinned tab is gone. Users who use pinned tabs are likely to want more convenient access to it than having to switch back to the window with the pinned tab.
Proposal
When users pin a tab, pin it across all windows. This is similar to how FireFox and Safari do it.
Edited by Kdwk