where to add a key and text pair? in the your option section there is only details and permissions, no place to add pair.

This is a great Add-on within Firefox. As long as you follow the directions and push "CTRL" and period "." at the same time right after your key, it works every time. I love the new date and timestamp feature which is easily implemented by adding [[Now]] in the text for any key. Thank you for putting the time and effort in to this Add-on.

https://addons.mozilla.org/en-GB/firefox/addon/quickscripts/reviews/1451761/ noted with thanks. It works, however …

… the predefined keyboard shortcut conflicts with the predefined shortcut for Mozilla's 'Firefox Multi-Account Containers' extension.

The shortcuts are not configurable (with Waterfox Classic, which was originally based on Firefox 56.0.2) and so I simply can not use both extensions.