A Firefox extension which extracts cache coordinates from the pages of geocaching websites
The coordinates can then be extracted either as text (semicolon-separated) or as a GPX file.
This extension is based heavily on the gpx_creator extension by gishroni at https://github.com/gishroni/gpx_creator/
and also the Beastify example from Mozilla at https://github.com/mdn/webextensions-examples/tree/master/beastify
Home page: https://activityworkshop.net/software/thecoordinator
Mozilla page with install option: https://addons.mozilla.org/en-GB/firefox/addon/thecoordinator/