SummifyAllTables is a free Chrome add-on developed by ryanpcmcquen. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This handy tool allows users to easily insert a row into any table, with the sum of the values in a specified column.

With SummifyAllTables, users can streamline their workflow when working with tables. Instead of manually calculating and inserting the sum of a column, this add-on automates the process with just a click. By simply selecting the desired column, users can instantly insert a new row at the bottom of the table, displaying the sum of the column's values.

This add-on is especially useful for tasks that involve data analysis, financial calculations, or any situation where table summation is required. SummifyAllTables simplifies the process, saving users time and effort. It is a valuable tool for anyone who frequently works with tables in their browser.