The downside would be that Firefox would lose a percentage of its user base over night. This option would remove a lot of headaches regarding testing, development tools and other tasks related to engineering. Some might move to a different browser, depending on whether it continues to be supported on their platform. These users could continue to run the then-unsupported browser, similarly to how Chrome users can do so starting in February 2023. …Mozilla considers two main options right now:Įnding support in January 2023 would alienate about 15% of the browser’s user base.