Phosphor — A Dark Neon Theme for JDownloader 2

A neon green terminal-style theme for JDownloader 2. Inspired by CRT phosphor monitors, Matrix, and Fallout terminals.

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What it looks like

• Near-black backgrounds (#0e0e0e) with layered dark surfaces
• Neon green (#39ff7a) accent on selected rows, progress bars, tabs, icons
• Monochromatic green icon set (250+ icons)
• Full dark chrome — menus, toolbars, scrollbars, checkboxes, tooltips

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Files

File	Description
FlatPhosphor.jar	Main theme file — colors, icons and class bundled
FlatDarkLaf.json	JD2-specific color overrides
images\	Icon set (used for manual installation)
src\Phosphor.java	Theme class source
src\Phosphor.properties	FlatLaf color properties

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Installation

0. Go to Code (green button above) → Download ZIP
1. Right-click your JDownloader 2 shortcut → Properties → Open File Location
2. Extract the ZIP you downloaded
3. Close JDownloader 2 completely
4. Copy FlatPhosphor.jar to JDownloader 2\libs\laf\
5. Create JDownloader 2\cfg\laf\ if it doesn't exist, then copy FlatDarkLaf.json there
6. Create JDownloader 2\themes\phosphor\org\jdownloader\images\ and copy the contents of the images\ folder there
7. Open JDownloader 2
8. Go to Settings → Advanced Settings
9. Search customlookandfeelclass → set value to com.github.deviceargent.phosphor.Phosphor
10. Search iconsetid → set value to phosphor
11. Restart JDownloader 2

After a JDownloader update

JDownloader may overwrite files in libs\laf\ after an automatic update. If the theme reverts:

1. Copy FlatPhosphor.jar back to libs\laf\
2. Verify customlookandfeelclass and iconsetid settings are still set
3. Restart JDownloader 2

Keep a backup of the files somewhere easy to find.

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Paths by OS

Windows:

%LOCALAPPDATA%\JDownloader 2\libs\laf\
%LOCALAPPDATA%\JDownloader 2\cfg\laf\
%LOCALAPPDATA%\JDownloader 2\themes\phosphor\org\jdownloader\images\

Linux:

~/JDownloader2/libs/laf/
~/JDownloader2/cfg/laf/
~/JDownloader2/themes/phosphor/org/jdownloader/images/

macOS:

~/Library/JDownloader 2/libs/laf/
~/Library/JDownloader 2/cfg/laf/
~/Library/JDownloader 2/themes/phosphor/org/jdownloader/images/

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Building from source

Requirements: JDK 8+, flatlaf.jar from your JDownloader 2 libs\laf\ folder.

cd phosphor-build
mkdir bin
javac -cp "path\to\flatlaf.jar" -d bin src\com\github\deviceargent\phosphor\Phosphor.java
copy src\com\github\deviceargent\phosphor\Phosphor.properties bin\com\github\deviceargent\phosphor\
jar cvf FlatPhosphor.jar -C bin . -C . themes

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Credits

FlatLaf — Java Swing Look and Feel library
© JFormDesigner GmbH
Licensed under the Apache License 2.0
https://www.formdev.com/flatlaf/

Icon set — Based on material-darker-jdownloader by moktavizen
Licensed under the MIT License
https://github.com/moktavizen/material-darker-jdownloader
Icons recolored to neon green (#39ff7a) for this theme.

Theme colors and Phosphor.properties — Original work, free to use and redistribute.

Special thanks to jiaz from the JDownloader team for guidance on the theming system.

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License

Phosphor is distributed under the MIT License.

FlatPhosphor.jar includes FlatLaf under Apache 2.0 and icons under MIT.

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Notes

👤 Author

DeviceArgent

• The official JDownloader 2 logo icon intentionally retains its original orange/yellow color as a visual anchor and out of respect for the JDownloader project.
• Tested on Windows 10/11. Should work on Linux and macOS with path adjustments.
• Official integration as FLATLAF_PHOSPHOR in the JDownloader theme list is currently in progress with the JDownloader team.