Firefox 107 for developers

This article provides information about the changes in Firefox 107 that will affect developers. Firefox 107 was released on November 15, 2022.

Changes for web developers

HTML

No notable changes

MathML

  • Deprecated lquote and rquote attributes of the <ms> MathML element for custom opening and closing quotes are now disabled. This behavior is configured via the mathml.ms_lquote_rquote_attributes.disabled preference which is set to true by default (bug 1793387).

CSS

JavaScript

No notable changes

APIs

Removals

WebDriver conformance (WebDriver BiDi, Marionette)

WebDriver BiDi

  • Added Realm support to target argument for script.evaluate, script.callFunction, and script.disown commands (bug 1779231).
  • Added support for JSON serialization of complex objects with container value fields, eg. WeakMap and Uint8Array (bug 1770754).
  • Added support for the context parameter of the browsingContext.create command, which allows opening a new tab related to an existing one (bug 1765619).
  • Improved reliability of the browsingContext.navigate command when called with the wait parameter set to none (bug 1763109).

Marionette

  • The command WebDriver:ElementSendKeys now only sets the caret if the element is not focused yet (bug 1791736).
  • Updated the command WebDriver:PerformAction to no longer accept undefined as value for various parameters of the pointerMove and wheel actions (bug 1781066).
  • Updated the Selenium Atoms to match a recent WebDriver specification change (bug 1771942).

Changes for add-on developers

Removals

Other

  • The error property returned when an error occurs in scripting.executeScript now represents any value the script throws or rejects with, instead of being just an object with a message property bug 1740608.

Older versions