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Firefox Beta and Developer Edition
Release Notes

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

102.0beta Firefox Beta

May 31, 2022

Version 102.0beta, first offered to Beta channel users on May 31, 2022

Warning: Features listed here may or may not make a final release of Firefox.

In addition to these release notes, you can follow ongoing development via our @FirefoxBeta Twitter account.


  • Improved PDF reading in high contrast mode

  • On Linux, Firefox will use Geoclue if available on the system for geolocation.


  • There is now an enterprise policy (StartDownloadsInTempDirectory) and an about:config pref ( that will once again cause Firefox to initially put downloads in (a subfolder of) the OS temp folder, instead of the download folder configured in Firefox. Files opened from the "what should Firefox do with this file" dialog, or set to open in helper applications automatically, will stay in this folder. Files saved (not opened as previously mentioned) will still end up in the Firefox download folder.


Web Platform

  • We now support the Content-Security-Policy (CSP) directive 'wasm-unsafe-eval'. This means existing web pages that have strict CSP might now block WebAssembly from executing.

  • TransformStreams has landed, allowing you to pipe from a ReadableStream to a WritableStream, executing a transformation on chunks

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