When using their web UI with Firefox and ublock origin it regularly freezes the tab when the answer is written out. Someone at Anthropic had to create a letter-by-letter typing animation with GIF image and sentry callbacks every five seconds, which ends up in an infinite loop.

I've seen reports about this bug affecting Firefox users since Q3 2025. They were reported over various channels.

Not a fan of them prioritizing the combat against opencode instead of fixing issues that affect paying users.

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recursive 4 hours ago | parent [-]

How can you be sure the issue is not with ublock?

	▲	bflesch 4 hours ago \| parent [-]
		It also happens with extensions and Firefox adblocker disabled. Might be connected to one of the Firefox anti tracking features, but I was unable to figure it out. The profiler shows an infinite loop. I've found several reports about this issue. Seems they don't care about Firefox.