Check All

Check All is a nifty Firefox extension that performs an uncomplicated yet important function with great proficiency. The extension operates in a straightforward manner: you simply select one or numerous checkboxes, then right-click to generate the option to either "Check all selected checkboxes" or "Uncheck all selected checkboxes". It's the ideal solution for websites that lack a "check all" alternative, as it provides the ability to check or uncheck multiple checkboxes with ease.

The basic steps are: select the checkboxes you want to modify, right-click, and choose the desired action from the context menu. And that's all there is to it! The extension's sole system requirement is Firefox, which should not prove to be an obstacle for most users. With its excellent execution of a much-needed feature, Check All is definitely worth installing if you deal with a lot of checkboxes in Firefox.