[Bug] Built-in pdf-viewer not working in Firefox

[g-wenzel]

Steps to Reproduce

1. Open any project in Firefox.
2. Compile with built-in pdf-viewer selected in preferences
3. Error message is displayed in pdf-viewer.
4. All projects can be viewed with native pdf-viewer in Firefox on the same computer
5. All projects can be viewed with built-in pdf-viewer in Chromium-based browser (Edge) on the same computer

Expected Behaviour

Pdf should be displayed after comiling.

Observed Behaviour

Blank pdf is displayed first. Error message pops up either sponanously or when trying to scroll in built-in pdf-viewer

Context

Can not use forward/backward search feature with native pdf-viewer.

Technical Info

Browser console log

• URL:
• Browser Name and version: Firefox for Windows, 86.0 (64-Bit)
• Operating System and version (desktop or mobile): Windows 10 Pro 2004, build 19041.804
• Signed in as: gregor.wenzel at charite.de
• Project and/or file: all projects

[das7pad]

Hi!

Thank you for taking the time to write up this issue.

We are in the process of migrating to a monorepo at https://github.com/overleaf/overleaf and will mark this repository read-only soon.
You can read more about the monorepo migration at overleaf/overleaf#923.

We are going to close this issue now to avoid any confusion about the inability to comment further.

If you believe this issue still needs addressing, please create a new issue at https://github.com/overleaf/overleaf.

Thanks again!