Three-Digit Browser Versions in March 2022

While relying on browser User-Agent strings for decision-making is generally discouraged, it's a common practice. A significant change is approaching, namely the transition to three-digit browser version numbers.

Karl Dubost highlights this shift, particularly noting Firefox's planned transition:

Firefox Nightly is projected to reach version 100 in the first quarter of 2022 (likely March), leading to a stable release around May 2022 (subject to change). Chrome's release calendar also indicates a similar timeframe, around March 29, 2022.

This means User-Agent strings will soon resemble:

<code>Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:100.0) Gecko/20100101 Firefox/100.0</code>

<code>Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.0.0 Safari/537.36</code>

This update poses challenges. Poorly constructed regular expressions (regex) will inevitably cause issues, and even simple string comparisons could fail, as Karl points out:

<code>"80"</code>

It's crucial to review code that uses navigator.userAgent and update accordingly to avoid compatibility problems with these upcoming three-digit version numbers. A thorough code audit is recommended.

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