This script has only been tested under Greasemonkey 4 (Firefox), ViolentMonkey (Firefox), and TamperMonkey (Chrome) but should work on any other UserScript host which provides the necessary GM_* or GM.* APIs.
The settings dialog is accessible via a "Configure Sale Helper..." option which appears either in the page context menu (Greasemonkey 4) or the userscript menu (all other userscript hosts) on relevant pages.
NOTE:
- Currently, after editing the settings, you must reload the page to apply changes.
- If you don't collapse GOG's filter groups in the sidebar, you're likely to be left with a big gap between the non-hidden games and the paginator.
