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Update

Firefox's QUIC stack is moving to a Rust based UDP I/O stack that leverages

FirefoxFirefox
Mozilla

Version 140.0.4, first offered to Release channel users on July 8, 2025

New:

  • Firefox's QUIC stack is moving to a Rust based UDP I/O stack that leverages various modern, operating system specific calls, resulting in improved HTTP/3 upload and download performance.

Fixed:

  • Fixed incorrect font selection in some cases when attempting to use color fonts. (Bug 1971053)
  • Fixed the search results not updating when switching source during a file search in the Developer Tool's debugger. (Bug 1971094)
More updatesTo the product
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