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What is this?
StreamFirefly (流萤) is a local-first tool for finding and downloading media on web pages. A browser extension detects videos, audio, images and HLS/DASH manifests, while a Rust-based Windows native helper handles the actual downloading, queuing, resuming and FFmpeg merging; tasks and settings stay on your machine.
StreamFirefly (流萤) is a local-first tool for finding and downloading media on web pages. A browser extension detects videos, audio, images and HLS/DASH manifests, while a Rust-based Windows native helper handles the actual downloading, queuing, resuming and FFmpeg merging; tasks and settings stay on your machine.Is this just a browser extension, or does it need something else installed?It's two pieces working together: a Chrome/Edge/Firefox extension for detecting media and showing the UI, plus a separate Windows native helper app that performs the actual downloads.
It's two pieces working together: a Chrome/Edge/Firefox extension for detecting media and showing the UI, plus a separate Windows native helper app that performs the actual downloads.Does the native helper run on Mac or Linux, or only Windows?Only Windows — the native helper is a Windows app. Building from source additionally needs Node.js 24, Rust 1.98 with the MSVC toolchain, and Chrome/Edge 116+ or Firefox 140+; the helper itself relies on Windows' built-in curl and FFmpeg for HLS/DASH merging.
Only Windows — the native helper is a Windows app. Building from source additionally needs Node.js 24, Rust 1.98 with the MSVC toolchain, and Chrome/Edge 116+ or Firefox 140+; the helper itself relies on Windows' built-in curl and FFmpeg for HLS/DASH merging.Can it download DRM-protected streams?No. StreamFirefly explicitly refuses to bypass DRM or SAMPLE-AES protection — it only flags such content without downloading it, and is meant only for media you already own or are authorized to save.
No. StreamFirefly explicitly refuses to bypass DRM or SAMPLE-AES protection — it only flags such content without downloading it, and is meant only for media you already own or are authorized to save.What if the video started playing before I opened StreamFirefly?It backfills the manifest from the page's resource-timing data at the moment you open it, so you can still catch streams that started loading earlier.
It backfills the manifest from the page's resource-timing data at the moment you open it, so you can still catch streams that started loading earlier.Can it detect manifests that a page generates dynamically via scripts?Yes, by turning on 'Deep Search' (off by default), which watches JSON.parse, Base64 decoding, and same-origin Worker output for full HLS/MPD text that would otherwise be missed.
Yes, by turning on 'Deep Search' (off by default), which watches JSON.parse, Base64 decoding, and same-origin Worker output for full HLS/MPD text that would otherwise be missed.Can I record a live HLS stream instead of just a VOD?Yes, HLS live streams can be manually started, paused and stopped for recording from the parsing page.
Yes, HLS live streams can be manually started, paused and stopped for recording from the parsing page.Can downloads be sent to an external tool like Aria2?Yes, the optional external-tools feature can forward resources to Aria2, an HTTP service, a local program, or a custom protocol, previewing the expanded parameters before sending.
Yes, the optional external-tools feature can forward resources to Aria2, an HTTP service, a local program, or a custom protocol, previewing the expanded parameters before sending.What are similar projects?cat-catch, N_m3u8DL-CLI, Tailtab, clients, ext-saladict, maxurl, desktop_gifs, Telegram-Media-Downloader
cat-catch, N_m3u8DL-CLI, Tailtab, clients, ext-saladict, maxurl, desktop_gifs, Telegram-Media-DownloaderWhich topics is it in?edge-extension, webextension, dash, media-downloader, firefox-addon, m3u8, hls, live-streaming, video-downloader, firefox, video-streaming, firefox-extension
edge-extension, webextension, dash, media-downloader, firefox-addon, m3u8, hls, live-streaming, video-downloader, firefox, video-streaming, firefox-extension