Old Reddit Offline Video Download by Jared Dishman

Download Reddit-hosted videos, entirely in your browser.

About this extension

A Firefox extension that adds a Download button to Reddit-hosted video posts, saving them as MP4 files with audio. All entirely in the browser, no external services required.

Features

Only works on old Reddit (old.reddit.com)
No data leaves your browser. All processing is done locally
Merges the separate video and audio streams Reddit serves via DASH into a single MP4
Shows a progress bar during fetch and mux stages

How It Works

Reddit hosts videos as DASH streams: a video-only track and an audio-only track served separately from v.redd.it. This extension:

Detects video posts via DOM attributes, <shreddit-player> elements, and the DASH manifest
Injects a Download button into each post's action bar
On click, the background script fetches the video and audio streams with progress reporting
The streams are remuxed into a standard non-fragmented MP4 using a custom mp4box-based pipeline
The finished file is downloaded directly to your browser's downloads folder

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Old Reddit Offline Video Download by Jared Dishman

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