Chrome and Firefox will reach version 100 in a couple of months. This has the potential to cause breakage on sites that rely on identifying the browser version to perform business logic. This post covers the timeline of events, the strategies that Chrome and Firefox are taking to mitigate the impact, and how you can help.
Just skip 9.
Obviously things shouldn’t break because of a simple version number, but at the same time why have they gone through major version numbers so quickly? IMHO major version numbers should only get bumped with significant and potentially breaking changes.