User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

1. restart with addons disabled

2. navigate to https://www.alumniweb.ox.ac.uk/jesus/file/Content_01_28_WEB-compressed-2.pdf

I am on 67.0.2, macos 10.14.5, macbook pro, late 2016 model. Iris Graphics 540 1536 MB

Actual results:

there is just a white screen displayed

Expected results:

chrome displays a multi-page document

firefox should also display document

Build ID 20190619235627
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0

I've managed to reproduce the issue on the latest version of Firefox (v67.0.4) using macOS 10.14.5. The issue is also reproducible on the latest Nightly version (69.0a1). The first step is not necessary, the issue occurs also with the addons enabled.

Please note that the file is downloaded when the link is accessed instead of being displayed.

The priority flag is not set for this bug.
:bdahl, could you have a look please?

For more information, please visit auto_nag documentation.

The http response headers have: content-disposition: filename="Content_01_28_WEB-compressed-2.pdf", so it's expected the file will download. I agree that it would be nice to still preview the file, but there's a bug for that already.