A simple addon that adds two buttons to the Addon setting menu, Unselect All and Select All.
If you have all addons selected, 'Unselect All' will unselect everything.
If you have a subset of addons selected, 'Unselect All' will unselect everything, but save which ones you had set, and change the button to 'Select Saved'
It also mouse activates the labels of the addons, so you can click those to select/deselect
If you select/deselect a single addon, then shift click on another addon further down or up the list, all intervening addons will select/deselect
Basically used to quickly test addon conflicts without having to untick everything.