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JXR at a glance
JXR
JPEG XR grew from Microsoft's HD Photo work and then moved through standards bodies, but it remained much more niche than formats such as JPEG, PNG, or later AVIF/WebP families.
XUL at a glance
XUL
XUL emerged in the early Mozilla era and powered Firefox's interface and add-on ecosystem for years before Firefox Quantum and the WebExtensions shift made most mainstream XUL workflows legacy.
Format comparison
| Feature | JXR | XUL |
|---|---|---|
| File type | Image | Document |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2009 | 1999 |
| Inventor | Microsoft | Mozilla (David Hyatt, others) |
| Status | active | legacy |
| Primary use cases |
|
|
| Vector scaling | Not supported | Not supported |
When to use each format
When to use JXR
- Your source file is already in JXR.
- Preserve source expectations before exporting to XUL.
- JXR is commonly used in image workflows.
When to use XUL
- Your target workflow expects XUL.
- Improve delivery compatibility with XUL.
- XUL is commonly used in document workflows.
FAQs
Why convert JXR to XUL?
Legacy Firefox/Mozilla application development, XUL extension migration to WebExtensions, and Mozilla platform interface documentation.
What changes when converting JXR to XUL?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting JXR to XUL?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.