Browser Integration

Grabr includes custom browser extensions for Google Chrome, Microsoft Edge, and Mozilla Firefox to capture downloads and route them directly to the Grabr background daemon.

Features

Automatic Interception: Intercepts standard download clicks on files matching custom extensions (e.g., .zip, .tar.gz, .dmg, .iso, .exe) or files exceeding a user-defined size threshold.
Context Menu Download: Right-click any hyperlink and select "Send link to Grabr" to instantly queue it.
Selection Batch Downloader: Highlight text containing multiple URLs, right-click, and select "Download links in selection with Grabr" to download them all in parallel.
Real-time Popup UI: Manage downloads from the toolbar popup showing speed, progress, ETA, and download control buttons, updated dynamically using WebSockets.
YouTube Format Selector: Click the extension popup on any YouTube video page to list and choose from all available video resolutions (including 4K, 1080p, etc.) and audio-only streams before downloading.

Installation

Google Chrome / Chromium

Coming soon — Chrome Web Store listing is in progress. Load manually for now:

Open Google Chrome and navigate to chrome://extensions.
Toggle on Developer mode in the top-right corner.
Click Load unpacked in the top-left.
Navigate to your local Grabr repository folder and select the /extension/google directory.

Microsoft Edge

Coming soon — Edge Add-ons listing is in progress. Load manually for now:

Open Microsoft Edge and navigate to edge://extensions.
Toggle on Developer mode in the bottom-left corner.
Click Load unpacked in the top-left.
Navigate to your local Grabr repository folder and select the /extension/edge directory.

Mozilla Firefox

Store: Install from Mozilla Add-ons

Or load it manually for development:

Open Mozilla Firefox and navigate to about:debugging#/runtime/this-firefox.
Click Load Temporary Add-on... on the right side.
Navigate to your local Grabr repository folder and select the manifest.json file inside the /extension/firefox directory.

Configuration

Click on the extension's icon in the toolbar, then click the gear icon to open the Settings Page. Here, you can configure:

Setting	Description	Default
Server URL	The URL where the Grabr daemon is running.	http://localhost:7474
Auto Intercept	Enable/disable automatic download interception.	Enabled
File Types	Comma-separated file extensions to intercept automatically.	zip, tar.gz, dmg, iso, exe, pkg, rar, 7z
Size Threshold	Minimum file size (in MB) to trigger automatic interception.	0 MB (All sizes)
Save Directory	Path on the local filesystem where files should be saved.	(empty)

Daemon Communication

The browser extension communicates with the local Grabr daemon using:

HTTP API: To add jobs and query statuses dynamically.
WebSocket: For receiving real-time progress updates, active download counts, and job status modifications.

Note: Make sure the Grabr daemon is running (grabr daemon start) in the background so the extension can establish a connection.