This extension is almost exactly what I’ve been looking for — it’s a great concept and very close to being perfect for dancers or anyone who wants to repeat specific parts of a video.

Here’s what would make it truly useful for that purpose:

Shortcut for “Apply” or “Play From Start Time”
Add an extra shortcut option to instantly play from the most recently set start time, without needing to specify an end time. Too often I just want to mark a single point and quickly replay from there — not necessarily define a full interval.

Enable shortcuts in Fullscreen mode
Currently, the keyboard shortcuts don’t work while the video is in fullscreen. Having them work there would make practice sessions much smoother.

Fix UI overlap with “Enhancer for YouTube™”
The interface elements overlap when both extensions are active. Since “Enhancer” is widely used, it would be great if this could be made compatible.

Add “Options” to the add-on list drop-down menu (gear icon)
It’d be convenient to access preferences directly from the extension menu.

As a side note, I realize that what I’m suggesting might simplify or even bypass some of the extension’s advanced multi-interval features. Maybe a add-on checkbox option like a “Quick Replay Mode” could help — a lightweight setting focused purely on fast marking and replaying from a single timestamp, while keeping the full functionality available for regular use.

In short, I’m looking for a way to quickly set a start time and replay from it — all via keyboard shortcuts, ideally without leaving fullscreen. Thanks for the fantastic work so far and for considering these improvements!

works, but it would improve the functionality a lot if i could select the times to loop from the current time on the video. i don't know. i've been trying for the last hour to stitch together a replacement for mirrortube on chrome and though i guess i've done it, it just doesn't function nearly as smoothly.
edit: by smoothly i just meant like. going through the motions of use, if that makes sense. it isn't a problem with the extension. have a nice day!