Slides not loading in latest Firefox

Problem: some slides won’t load in latest update of Firefox, first couple of slides play then they stop loading, problem doesn’t occur in Chrome or Edge.

ActivePresenter version: 7.5.15

OS: Win 10

Notes: Firefox version 89.0 (64-bit)


It would be helpful if you can share your project and its external data folder (named PROJECT_FILE_files) (if any) via so we can take a look?

Kind regards,