slow! / Simple Form Saver

I installed Simple Form Saver and it works very well.

Is there a way to edit the script so that it will fill in a pop-up textbox with the information from a checked checkbox on the same page?

Checkbox example:

input[type="checkbox"] + label
⚫ cbNo1-22.6—on:‎: off

Comment Box example:

Format name [--default]::value
Type of (name::value)

I am thinking that when I check off checkbox cbNo1-22.6, for example, the script could either fill in the textbox on the page or fill in a generic floating textbox that I could copy and paste into another form.