Front Browser supports these bundle IDs:
If the results are to be saved to a variable or a clipboard then further text areas appear in the action allowing you to specify the variable or specific clipboard.
// Get Keyboard Maestro variable "My KM Data" var myData = document.kmvar.My_KM_Data
⚠️ Note that because your variables are passed to the web page, any other scripts running on that web page will have access them, and this could be a privacy issue if the information is misused by the web page.
If you need to set more than one Keyboard Maestro Variable, one approach is to return the data for each variable on a separate line (or with delimiters of your choice), and then parse in a following Search using Regular Expression.