I doubt this permission prompt would include implicitly cached content (the browser would just clean up the oldest stuff). Unless the site is explicitly downloading and caching video I wouldn’t expect that to count.
Quite possible that there is some sort of storage leak in the frontend.
If they’ve somehow ended up caching a lot of videos and pictures, I could see it happening. I’d try clearing the cache, see what happens.
I doubt this permission prompt would include implicitly cached content (the browser would just clean up the oldest stuff). Unless the site is explicitly downloading and caching video I wouldn’t expect that to count.
Quite possible that there is some sort of storage leak in the frontend.