Firefox Beta and Developer Edition
Release Notes

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 (browser.download.start_downloads_in_tmp_dir) 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.

You can now filter style sheets in the Style Editor tab of our developer tools

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