1816853 - Firefox pdfviewer show black rectangles instead of spaces

Status: RESOLVED INVALID

(Firefox :: PDF Viewer, defect)

Description

[tomkobat]

Attachment: Screenshot from 2023-02-15 10-10-45.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0

Steps to reproduce:

I updated firefox to version 110 (flatpak), and I opened pdf at this link: https://insis.vse.cz/zp/77457

Actual results:

The pdfviewer shows black rectangles instead of spaces.

Expected results:

The pdfviewer should display spaces correct as it shown in previous versions.

Comment 1

[Calixte Denizet (:calixte)]

I'm not able to find the screenshoted page in the pdf.
Could you attach the pdf in this bug and give us the page number where the problem is ?

Comment 2

[tomkobat]

Attachment: zaverecna_prace-46-pages-1-3.pdf

I added the file, it happens on all three pages.

Comment 3

[tomkobat]

Attachment: The_Golden_Ratio-A_Contrary_Viewpoint-1-3.pdf

There is another example where this bug happens. It happens on the second page.

Comment 4

[Calixte Denizet (:calixte)]

I can't reproduce neither on Windows 11 nor on Fedora 37.
Could you try in nightly ?
If you think it's a regression, could you try to find a potential culprit with mozregression ?

Comment 5

[Calixte Denizet (:calixte)]

I set up an Ubuntu 22.04 in a VM, I snaped Firefox 110 and unfortunately I can't reproduce your issue.
I dived into the pdf itself.
The font used to render those spaces is /TimesNewRomanPSMT but it isn't embedded in the pdf, hence we fallback Times, sans-serif when rendering it on the canvas.
I suppose that sans-serif isn't involved here else you'd have already noticed it, so likely you've a font called Times (or there's a substitution for it) on your system, and this font has a black square for the glyph used to render a space.

Comment 6

[Negritas Sergiu, Desktop QA]

Hello! I have tried to reproduce the issue using firefox 112.0a1 (2023-02-16) on Windows 10 and Ubuntu 22.04 but unfortunately I wasn't able to reproduce it on my end.
Could you please answer the following questions in order to further investigate this issue?

1. Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
2. Does this issue happen in the latest nightly? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/
3. Do you have any addons installed if so can you list them?

Comment 7

[tomkobat]

Hi, I tested it with add-ons disabled and the issue is was not present. I am closing the issue for now. Sorry for the inconvinience!

Comment 8

[Calixte Denizet (:calixte)]

:tomkobat, if you know how to reproduce the bug it'd be nice to test with the built available here:
https://bugzilla.mozilla.org/show_bug.cgi?id=1825293#c19
and then give your feedback in bug 1825293. Thank you.