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v3.9.9 Breaking

This release includes breaking changes for platform teams planning a safe upgrade.

Published 15d Secrets & Credentials
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

cosmopolitan-libc data-transfer end-to-end-encryption file-sharing folder-share networking
+4 more
peer-to-peer transfer tunnel webrtc

ReleasePort's take

Light signal
editorial:auto 15d

Version v3.9.9 adds .webp support to the web UI previewer and fixes several preview‑related bugs, while also expanding native binaries for Linux, macOS, and APE.

Why it matters: Improves media handling in previews and resolves stability issues; new glibc builds ensure compatibility on modern and legacy Linux systems, and additional macOS and cross‑platform binaries broaden deployment options.

Summary

AI summary

Broad release touches Windows, 🖼️ Web Preview Enhancements, native, and macOS.

Changes in this release

Feature Low

Adds .webp image support to web UI previewer.

Adds .webp image support to web UI previewer.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Feature Low

Adds Apple Silicon (arm64) macOS binary build.

Adds Apple Silicon (arm64) macOS binary build.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Feature Low

Adds Intel (x86_64) macOS binary build.

Adds Intel (x86_64) macOS binary build.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Feature Low

Adds APE single‑file cross‑platform executable `ffl.com`.

Adds APE single‑file cross‑platform executable `ffl.com`.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Feature Low

Adds APE alternative build `fflo.com` without proprietary addons, omitting server‑upload feature.

Adds APE alternative build `fflo.com` without proprietary addons, omitting server‑upload feature.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Dependency Low

Provides glibc 2.39+ optimized build for newer Linux distributions.

Provides glibc 2.39+ optimized build for newer Linux distributions.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Dependency Low

Provides glibc 2.28+ compatibility build for older Linux distributions.

Provides glibc 2.28+ compatibility build for older Linux distributions.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Bugfix Medium

Fixes error when previewing files without extension in web UI.

Fixes error when previewing files without extension in web UI.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Bugfix Medium

Resolves race condition causing untranslated text in web UI previews.

Resolves race condition causing untranslated text in web UI previews.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Bugfix Medium

CLI now handles abrupt browser disconnects gracefully without traceback output.

CLI now handles abrupt browser disconnects gracefully without traceback output.

Source: llm_adapter@2026-06-01

Confidence: high

 —
Full changelog

🚀 What's New in v3.9.9

This is a minor patch release focused on polishing the web preview experience and cleaning up terminal outputs during unexpected client disconnections.

🖼️ Web Preview Enhancements

  • .webp & Extensionless Support: The web UI previewer now fully supports .webp images. Additionally, we fixed a bug where attempting to preview files without a file extension would throw an error.
  • i18n Timing Fixes: Resolved a race condition in the web UI where certain preview-related text elements would render before the translations (i18n) were fully loaded, causing them to temporarily appear untranslated.

🐛 CLI Stability & Polish

  • Graceful Disconnects: If a downloader abruptly refreshes their browser or drops the connection mid-transfer, the sender's CLI will now handle the interruption gracefully. It will quietly clean up the session instead of dumping an ugly call stack (traceback) into your terminal.

Windows (native)

  • x86_64 → ffl-v3.9.9-x86_64-windows.zip
    Unzip to get ffl.exe.

Linux (native)

We publish two glibc baselines. Pick the highest baseline that does not exceed your system glibc:

  • glibc 2.39+ — smaller & faster

    • ffl-v3.9.9-manylinux_glibc2.39-x86_64-linux.tar.gz
    • Best for newer distros (e.g., Ubuntu 24).

  • glibc 2.28+ — widest compatibility

    • ffl-v3.9.9-manylinux_glibc2.28-x86_64-linux.tar.gz
    • Works on older distros (e.g., Ubuntu 20); larger due to additional internal linking.

⚠️ If your system is musl-based (e.g., Alpine) or you’re unsure about glibc, prefer APE ffl.com.

macOS (native)

  • Apple Silicon (arm64) → ffl-v3.9.9-aarch-darwin.tar.gz
  • Intel (x86_64) → ffl-v3.9.9-x86_64-darwin.tar.gz

The archive unpacks to a single ffl binary.

🧰 APE (cross-platform single file, zero external deps)

  • ffl.com — Single-file build that runs natively on Linux, macOS, Windows, FreeBSD, OpenBSD 7.3, NetBSD, BIOS, and Android (Termux).
  • fflo.com — Alternative APE build that is exactly aligned with the open-source repo (no additional/proprietary addons).
    As a result, features that require closed-source components—such as upload to server (e.g., --upload)—are not available.

For a deeper comparison between native and APE, see the README’s notes.

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