Firefox Release

July 13, 2021

Version 90.0, first offered to Release channel users on July 13, 2021

We'd like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!




  • The "Open Image in New Tab" context menu item now opens images and media in a background tab by default. Learn more

  • Most users without hardware accelerated WebRender will now be using software WebRender.

  • Improved software WebRender performance

  • FTP support has been removed



  • Developer Information
  • Support for Private Fields (TC39 proposal, stage 3) is available in DevTools. The support includes: object inspection, autocompletion, expression evaluation, variable tooltips, and pretty printing (bug)

  • The Network panel shows a preview of HTTP requests for fonts in the Response tab (bug)

    Network panel font preview screenshot

Web Platform

  • Support for Fetch Metadata Request Headers, which allows web applications to better protect themselves and their users against various cross-origin threats.

  • Added the ability to use client authentication certificates stored in hardware tokens or in Operating System storage.


  • Printing a page with scaling may result in truncated output (bug 1720621)

All Firefox downloads