Tab Count is a Safari App Extension with a simple mission: help you see with a single glance how many tabs and windows you have open. It achieves this goal by adding a badge to the extension's toolbar icon.
Additionally Tab Count can help you focus on your projects, by limiting the number of tabs that you can have open at any time. Select from two modes: close left-most tab, or prevent new tabs from opening.
Within the extensions popover, you may set thresholds as to how many tabs and/or windows ought to be open before a badge is applied. See the application settings for more options.
Additionally you have buttons to close all tabs to the left or right of the currently active tab.
The extension will not have access to your browsing data and your privacy is thus protected.