Firefox Nightly (build from 23.05.2026): YouTube pages crashing after a few seconds

Markus, please do submit a crash report (or make sure they're getting sent), and ideally post its ID here. Thanks.

That looks like https://crash-stats.mozilla.org/signature/?signature=mozilla%3A%3Adom%3A%3Acache%3A%3AReadStream%3A%3AInner%3A%3AEnsureStream

X    Build id 	 	# 	%%
1.   20260523100109 	24529 	88.76 %
2.   20260523212407 	3106 	11.24 %

Which points at:

•  https://bugzilla.mozilla.org/show_bug.cgi?id=2015967

This has already landed:

• https://bugzilla.mozilla.org/show_bug.cgi?id=2041703

The next Nightly should be fixed.

Reported as fixed in 20260524001456 🚀

Thanks for using Nightly to help surface these wrinkles! 🌘

(Adding the signature of mozilla::dom::cache::ReadStream::Inner::EnsureStream for search purposes.)

Markus, please do submit a crash report (or make sure they're getting sent), and ideally post its ID here. Thanks.

I reported about 50 crash reports, at least Firefox told me it sent that much while i tried finding out, what happended.