Here's a real example of that bug: Slack's message buttons (such as "Add reaction" or "Reply in thread") stopped working for Firefox versions >= 100 and <= 519

Here's a real example of that bug: Slack's message buttons (such as "Add reaction" or "Reply in thread") stopped working for Firefox versions >= 100 and <= 519. They mysteriously started working again for versions >= 520. The version string "100" compared as smaller than "52" in Slack's code, which activated some kind of webcompat workaround intended for Firefox versions < 52 that breaks on more recent Firefox versions. https://github.com/webcompat/web-bugs/issues/67866 https://github.com/webcompat/web-bugs/issues/67866