
Block further updates (unlimited, but insecure)Īnother option that Firefox users have is to block any updates to the browser so that Firefox won't get updated to version 57. Update: Read the how to run legacy extensions in Firefox guide for instructions. While some add-ons will continue to work at least for a while, it is unclear for how long, and for how long Mozilla plans to keep the preference in Nightly to keep on using legacy add-ons. Most add-ons that aren’t WebExtensions will be broken regardless.Ĭompatibility issues will grow over time when further changes are made to the Firefox web browser.

Starting with 57, many things will break that will also break add-ons. Jorge Villalobos, product manager for, confirms as much on the official Mozilla blog: This sounds good at first glance, but changes in the browser's core will render add-ons non-functional in Firefox 57.

Mozilla plans to ship Firefox Nightly with a preference to enable support for legacy add-ons.
