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SubFlex - Subtitle Controller version history - 3 versions

SubFlex - Subtitle Controller by Extension Flex

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SubFlex - Subtitle Controller version history - 3 versions

  • Be careful with old versions! These versions are displayed for testing and reference purposes.You should always use the latest version of an add-on.

  • Latest version

    Version 1.2.0

    Released Sep 19, 2026 - 210.19 KB
    Works with firefox 109.0 and later
    What's New in Version 1.2.0:
    • ✨ Obsidian Glass Player HUD: Completely redesigned floating control dock with unified 34px button heights and streamlined segmented offset controls.
    • 🌐 Live Video AI Translation: Real-time translation into 18+ languages (including Roman Hindi / Hinglish) with zero microphone permissions.
    • ⚡ 1-Click Subtitle Batch Translation: Translate entire loaded subtitle files directly into your preferred language with live progress indicator.
    • ⏱ Interactive Timeline Track Scrubber: Scrub and preview subtitles in real time without moving video playback.
    • 🎯 Auto-Fit Duration Engine: Automatically calculate and match subtitle duration to video length with one click.
    • 🔋 Performance & Memory Optimization: Eliminated idle animation loop repaints when the HUD dock is hidden.
    • 🛡 Strict CSP & Trusted Types Compliance: Full compatibility with modern video streaming platforms and fullscreen switching.

    Source code released under MIT License

    Download Firefox and get the extension
    Download file

  • Older versions

    Version 1.1.0

    Released Sep 13, 2026 - 192.88 KB
    Works with firefox 109.0 and later
    SubFlex v1.1.0 — Performance, Compatibility & Styling Update

    This release brings major subtitle parsing reliability improvements, format support, and visual customization:

    • Multi-Encoding Auto-Detection: Automatically detects UTF-8, UTF-16, and Windows-1252/Latin-1 character encodings, fixing broken accented characters (é, à, ñ, ü) on non-English subtitles.
    • Advanced Subtitle Formats: Added full support for loading and rendering ASS and SSA (.ass, .ssa) subtitle files alongside SRT and VTT.
    • Subtitle De-Spammer Filter: Automatically removes injected promotional watermarks and website spam cues from downloaded subtitles.
    • Custom Subtitle Styling: Customize font size, colors (Pure White, Cinema Yellow, Cyan Glow), and background box modes (Translucent Glass, Solid, Text Outline) directly from the popup settings.
    • Fullscreen & Player Robustness: Improved overlay anchoring when toggling fullscreen video across YouTube and embedded web players.
    • Quick Keyboard Shortcuts: Added quick hotkeys for nudging offset ([ / ]), resetting sync (), and toggling subtitles visibility (V).
    • Bug fixes and memory optimization for long-duration video playback.

    Source code released under MIT License

    Download file

  • Version 1.0.0

    Released Sep 8, 2026 - 185.84 KB
    Works with firefox 109.0 and later

    Source code released under MIT License

    Download file