Three major browsers are about to hit version 100. Will websites cope? [theregister.com]
This February Google put out Chrome 98 [googleblog.com], closely followed by Mozilla releasing Firefox 97 [mozilla.org]. Soon both will hit version 100.
The memory of the web industry is short. This has happened before: when Opera reached version 10 in 2009, it caused problems [maqentaer.com], and just three years later, Firefox 10 faced similar [mozilla.org] issues.
And it will happen again. Google is planning [chromestatus.com] to release Chrome 100 at the beginning of April, and Firefox 100 should follow [mozilla.org] in May.
Google anticipates that there will be some issues, so ever since Chrome 96 it has offered [chrome.com] a facility to force the version number to 100: just go to chrome://flags and set #force-major-version-to-100.
Also at XDA Developers [xda-developers.com].