QuickMultiselect 1.0 Requires Restart
by wbayever
Adds a column with checkboxes so that you can select multiple messages with only a mouse click.
About this Add-on
To add the column to a mail folder, click on the columns icon on the top right of the mail list and select "Multiselect". The checkbox column will show up on the left. You can then drag the checkbox column to reorder.