tabber

noun

1. A device for applying an adhesive tab.

   “Mail tabbers are an economical and timesaving alternative for mass mailings, such as newsletters and brochures. Instead of inserting the pages inside an envelope, which then needs to be sealed, a tabber places a small adhesive tab (or wafer seal) on folded sheets of paper to securely hold them shut.”

2. (in-compounds)One who wears a tab of a specified kind.

   “Under this system, outstanding freshmen cadets (green tabbers) are picked during the first semester, and "marked" with green shoulder tabs and green plastic lapel discs.”

   “But the sensitivity of the issue still lingered. To this day ex-servicemen still identify themselves as "Red Tabbers" or "Red Tab", […]”

3. A user who switches between tabs.

   “OmniWeb has a reputation for fast browsing, but if you're a card-carrying member of TA (Tabbers Anonymous), you need the 5.0 beta version to get that feature.”