Firefox 102 for developers

This article provides information about the changes in Firefox 102 that will affect developers. Firefox 102 was released on June 28, 2022.

Changes for web developers


No notable changes.


The update media feature that can be used to query the ability of the output device to modify the appearance of content after it is rendered is now available by default (Firefox bug 1422312).


No notable changes.



  • Support of the wasm-unsafe-eval CSP policy directive has been implemented. A document with a CSP that restricts scripts will no longer load and execute WebAssembly unless the CSP uses 'wasm-unsafe-eval' or the existing 'unsafe-eval' keyword (Firefox bug 1740263).


WebDriver conformance

WebDriver BiDi


  • Allow marionette to connect to a windowless instance of Firefox (Firefox bug 1726465).
  • Fixed issue where WebDriver:Navigate with a PageLoadStrategy of "none" returns before navigation has started (Firefox bug 1754132).
  • Fixed a potential race condition in WebDriver:SwitchToWindow when switching to a different tab (Firefox bug 1749666).

Changes for add-on developers

Older versions