Tabsmack от Nicolas B. Pierron

Moves the active tab to the start or end of the tab list. Convenient if you need to gather all your active tabs (the ones you're working on) at the same place, right at the beginning or at the end of the tab list, where it's convenient to find them.

The associated keyboard shortcuts are:
* send to start: "Ctrl-Shift-Home"
* send to end: "Ctrl-Shift-End"

("Ctrl" on windows/linux, "Command" on mac)