Press Option+X (Alt+X) to open a small dialog, type a regular expression and press Enter. Tabs whose title or URL matches are pulled together; everything else keeps its order. Option+S (Alt+S) re-sorts with the last pattern.
Matching is case-insensitive. A specific pattern like shop-123 groups every tab for that ticket. A general one like the built-in ticket-key example groups each distinct match separately, so all SHOP-123 tabs land together and all ABCD-1234 tabs land together. Dashes and underscores are treated the same, so a Jira ticket and its GitHub branch end up side by side.
Pinned tabs are never moved. Works in Firefox and Zen.
