Version 100 can hamper major website functionality in Mozilla Firefox and Google Chrome

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Google Chrome and Mozilla Firefox are approaching their version 100. Approaching version 100 could mean that users will experience inefficiency in accessing major websites in these browsers.

These inefficiencies can mean certain issues that lead to failed websites, technical issues, and several bugs.

As popular browsers hit their 100th release, developers are bracing instead of celebrating.


It has been discovered that three-digit version numbers embedded in browser user agents (UAs) can cause compatibility issues with a small number of websites.

Over the course of several months, Mozilla, Google and Microsoft have been issuing warnings about the impending release of version 100, which is slated for release in March for Chrome and Edge and May for Firefox and Internet Explorer. Both Mozilla and Google have undertaken trials to test websites and report any issues that may arise.

Chrome and Firefox reach version 100

According to Apple InsiderChrome uses version 98 while Firefox uses version 97. After the transition to three-digit version numbers, Mozilla warns of inconsistent difficulties on an unforeseen range of websites.

The website’s servers inspect what’s called the user agent to detect which browser is being used. They then use this information to adjust the websites so that they display correctly.

Over 12 years ago, when browsers initially reached version 10, many difficulties with user agent parsing libraries were discovered when the major version number went from one to two digits.

Since there is no uniform specification to adhere to, different browsers use different formats for the User-Agent string and site-specific User-Agent processing.

It’s likely that some parser libraries contain assumptions or hard-coded bugs that don’t take major three-digit version numbers into account.

As reported by The edgealthough it is feared that some websites may go down, a lot of work has been done behind the scenes, much like what was done to avoid serious issues with the Y2K bug 22 years ago to s’ ensure that the transition to version 100 goes smoothly.

Users of current versions of Chrome, Edge, and Firefox can set a specific flag that forces browsers to report version 100, which is useful for testing websites.

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Browser mitigation for version 100

Contingency preparations are also in place in case of widespread problems.

According to MozillaComment, as a backup strategy in Google Chrome, the browser uses a flag to freeze the major version number at 99. It reports the true major version number in the minor version component of the User-Agent string. The Chrome team will determine whether or not to use the backup option based on the number and severity of issues that would be reported once the issues occur.

Firefox also has an in-store backup policy, although the approach used in Firefox is determined by case significance. Firefox has a mechanism for interventions on the site.

With the use of this mechanism, the Web Compact team at Mozilla can fix faulty websites in Firefox.

Mozilla may temporarily freeze the main version of Firefox at 99 and then experiment with different options if the problem is widespread and individual site interventions become unmanageable.

Google, Mozilla, and Microsoft are working hard to avoid any major issues.

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