Test the actual course page
Training systems often combine videos, quizzes, iframes, SSO, and progress trackers. The only useful first test is the exact course page that keeps interrupting you, because a catalog page and an embedded lesson can behave differently.
- Run Test this page before starting a long lesson.
- Keep the visible indicator on so you can confirm local activity happened.
- Expect some SSO or embedded player rules to remain outside extension control.