"Without a single specification to follow, different browsers have different formats for the User-Agent string, and site-specific User-Agent parsing. Some of these issues, such as the one found on Duda, had been quickly fixed after they were reported.įor the most part, these issues have ranged from the websites stating the browser is unsupported to user interface issues affecting portions of the site. Since then, Mozilla has been keeping track of web bugs caused by the version 100 change and has found problems on websites for HBO Go, Bethesda, Yahoo, Slack, and those created by the Duda website builder. In both experiments, Mozilla and Google found a small number of websites that would not operate correctly when parsing a user-agent string that contained a three-digit version number. Google soon followed with their own experiment for Chrome 100. In August 2021, Mozilla launched an experiment to see if the three-digit 'Firefox/100' user-agent string would cause problems with websites. resistFingerprinting' setting set to 'True,' your user-agent will be locked to 'Firefox/78.0.'įor the current version of Google Chrome 98, the user-agent is: Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.82 Safari/537.36 Mozilla warns of version 100 user-agent strings This allows the web page to check the visitor's browser version and modify its response based on the features the browser supports.įor example, the current user-agent for Mozilla Firefox version 97 is: Mozilla/5.0 (Windows NT 10.0 Win64 圆4 rv:97.0) Gecko/20100101 Firefox/97.0 When a person visits a website, the browser's user-agent is sent along with the request for a web page.
Mozilla is warning website developers that the upcoming Firefox 100 and Chrome 100 versions may break websites when parsing user-agent strings containing three-digit version numbers.Ī user-agent is a string used by a web browser that includes information about the software, such as the browser name, its version number, and the various technologies it uses.
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