Firefox 83 for developers – Mozilla

This article provides information about the changes in Firefox 83 that will affect developers. Firefox 83 is the current Beta version of Firefox, and will ship on November 17, 2020.

Changes for web developers

Developer Tools


  • The crossorigin attribute is now supported for <link rel=icon> (bug 1661075).
  • The displaystyle attribute is now implemented for all MathML elements (bug 1666075).




No changes


No changes

WebDriver conformance (Marionette)

  • We’ve removed preliminary support for WebDriver:SwitchToShadowRoot, which hasn’t been added to the WebDriver specification yet (bug 1662468).
  • We fixed a bug in WebDriver:Back and WebDriver:Forward that caused Marionette to hang when the navigation was triggered from within an <iframe> that gets removed (bug 1672758).

Changes for add-on developers

No changes

Older versions

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