On Orion, PDFs generated via blob: URLs never open in the built-in viewer. They are always downloaded instead.
Steps to reproduce
Visit a page that creates a PDF with URL.createObjectURL(new Blob(..., { type: "application/pdf" })).
Click the link or button to open the PDF.
Orion starts a download instead of opening the PDF in a tab.
Actual
Automatic download. No viewer intercepts blob: URLs.
What I tried
Toggled Develop → Experimental Features → Enable PDF.js Viewer on and off.
Disabled all extensions.
Cleared cache, new profile, app restart.
Same behavior with and without Content-Disposition: attachment.
Notes
Direct PDF URLs (non-blob🙂 open in the viewer as expected.
Looks like a WebKit/pdf.js handling issue for blob: rather than a user setting.
Is this a known Orion/WebKit bug or expected behavior for blob:?
Any flag or option to force inline display for blob: PDFs?
Recommended workaround (site-side rewrite, headers, extension, other)?
Environment
Orion 0.99.136-beta (WebKit 622.1.15.19.2)
macOS 26.0
PDF.js viewer tested both enabled and disabled
Expected
Inline display in Orion’s PDF viewer.
Version 0.99.136-beta (WebKit 622.1.15.19.2)
Tahoe (26)
