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JDownloader Interceptor by Lood

This Firefox extension intercepts all download attempts and sends the file URL directly to JDownloader's LinkCollector using its local API.

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About this extension
JDownloader Download Interceptor for Firefox

Description

A Firefox extension that intercepts download requests and forwards them to your local JDownloader instance, allowing you to manage downloads centrally.

Modes

The extension offers three modes, switchable by clicking the toolbar icon:
  • Disabled: The extension is inactive. Firefox handles downloads normally.
  • Manual (default): Intercepts each download request and sends the link to JDownloader’s LinkCollector without starting the download. You can review and start downloads manually in JDownloader.
  • Automatic: Intercepts and automatically sends each download link to JDownloader’s LinkCollector and immediately starts the download in JDownloader.

The icon and tooltip update to indicate the current mode:
  • Disabled: grayed-out icon, title "Download Disabled"
  • Manual: default icon, title "Manual Mode"
  • Automatic: auto icon, title "Automatic Mode"

Features
  • Intercepts Firefox downloads via the Downloads API.
  • Forwards links to JDownloader’s local API endpoints:
  • addLinks in Manual mode
  • addLinksAndStartDownload in Automatic mode
  • Toggle modes instantly by clicking the toolbar icon.

Requirements
  • Firefox 91.0 or later
  • Local JDownloader installation
  • JDownloader’s deprecated API enabled (see Configuration)

Configuration
  1. Open JDownloader.
  2. Go to Settings → Advanced Settings.
  3. Search for DeprecatedApi.enabled and set it to true.
  4. Restart JDownloader.
Note: JDownloader’s deprecated API is disabled by default. It must be enabled for link forwarding to work.

Usage
  1. Click the extension icon to cycle through Disabled → Manual → Automatic.
  2. In Manual or Automatic mode, start any download in Firefox.
  3. The extension intercepts the download and sends the URL to JDownloader.
  4. In Manual mode: links appear in JDownloader’s LinkCollector awaiting manual start.
  5. In Automatic mode: downloads begin immediately in JDownloader.

Limitations
  • Only works with a locally running JDownloader instance.
  • Depends on the deprecated API; incompatible with remote JDownloader servers.

License

This project is licensed under the Mozilla Public License 2.0

https://www.mozilla.org/en-US/MPL/2.0/
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Permissions and dataLearn more

Required permissions:

  • Download files and read and modify the browser’s download history
  • Access your data for all websites
More information
Add-on Links
Version
1.3.3
Size
38.07 KB
Last updated
7 days ago (Jul 15, 2025)
Related Categories
License
Mozilla Public License 2.0
Version History
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Release notes for 1.3.3
JDownloader Download Interceptor for Firefox

Description

A Firefox extension that intercepts download requests and forwards them to your local JDownloader instance, allowing you to manage downloads centrally.

Modes

The extension offers three modes, switchable by clicking the toolbar icon:
  • Disabled: The extension is inactive. Firefox handles downloads normally.
  • Manual (default): Intercepts each download request and sends the link to JDownloader’s LinkCollector without starting the download. You can review and start downloads manually in JDownloader.
  • Automatic: Intercepts and automatically sends each download link to JDownloader’s LinkCollector and immediately starts the download in JDownloader.

The icon and tooltip update to indicate the current mode:
  • Disabled: grayed-out icon, title "Download Disabled"
  • Manual: default icon, title "Manual Mode"
  • Automatic: auto icon, title "Automatic Mode"

Features
  • Intercepts Firefox downloads via the Downloads API.
  • Forwards links to JDownloader’s local API endpoints:
  • addLinks in Manual mode
  • addLinksAndStartDownload in Automatic mode
  • Toggle modes instantly by clicking the toolbar icon.

Requirements
  • Firefox 91.0 or later
  • Local JDownloader installation
  • JDownloader’s deprecated API enabled (see Configuration)

Configuration
  1. Open JDownloader.
  2. Go to Settings → Advanced Settings.
  3. Search for DeprecatedApi.enabled and set it to true.
  4. Restart JDownloader.
Note: JDownloader’s deprecated API is disabled by default. It must be enabled for link forwarding to work.

Usage
  1. Click the extension icon to cycle through Disabled → Manual → Automatic.
  2. In Manual or Automatic mode, start any download in Firefox.
  3. The extension intercepts the download and sends the URL to JDownloader.
  4. In Manual mode: links appear in JDownloader’s LinkCollector awaiting manual start.
  5. In Automatic mode: downloads begin immediately in JDownloader.

Limitations
  • Only works with a locally running JDownloader instance.
  • Depends on the deprecated API; incompatible with remote JDownloader servers.

License

This project is licensed under the Mozilla Public License 2.0

https://www.mozilla.org/en-US/MPL/2.0/
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