Hi Danielle,
Helix3 framework itself load jquery script, for this case, if you wish to use Compress js to improve the page speed, please go to Plugin manager, find plugin name System – Regular Labs – Modals => tab Advanced => Use Media Versioning set to No
Clear caches and recheck. After that you can use compress js feature from helix framework and modal extension from Regularlab without any problem.
Thank you
