Quote:Mozilla announced today that it will sunset the Firefox Test Pilot program on January 22, 2019.

The organization launched Test Pilot in 2016 to test new Firefox features. Interested users could join the program to install experiments in the Firefox browser. They provided Mozilla with data in return, and Mozilla used the data to determine whether a particular experiment would be a good native fit for Firefox or better suited as an add-on.

Several Test Pilot experiments, e.g. Page Shot (which was renamed to Screenshots), Tracking Protection, or Activity Stream, were integrated natively in Firefox. Others, such as Containers or Snooze Tabs were released as extensions for the browser instead. Some Test Pilot experiments, e.g. No More 404s or Snooze Tabs  were retired without them being released as add-ons though.

Test Pilot will cease to exist on January 22, 2019. Existing experiments remain accessible on the Firefox Add-ons website. Experiments that are not available as browser extensions, Mozilla mentions Firefox Lockbox and Firefox Send, remain in active development.

Firefox Lockbox is an attempt to replace the native Firefox password manager, Firefox Send a file sharing service.

The Test Pilot add-on will be removed from Firefox when users visit the Test Pilot website on January 22 or later.

Full reading: https://www.ghacks.net/2019/01/16/mozilla-puts-firefox-test-pilot-program-to-rest/