Open
Description
Attach (recommended) or Link to PDF file
https://www.jma.go.jp/jma/press/2507/04a/20250704_asosan.pdf
Web browser and its version
Firefox 140.0.4 (64bit)
Operating system and its version
Windows 10 (version 22H2) (64bit)
PDF.js version
v5.3.93
Is the bug present in the latest PDF.js version?
Yes
Is a browser extension
No
Steps to reproduce the problem
- Launch Firefox.
- Open
about:config
and changebrowser.display.use_document_fonts
to 0. - Open link of PDF file.
What is the expected behavior?
All texts are visible.

What went wrong?
Some texts are hidden, only letter spaces are visible.

Link to a viewer
No response
Additional context
Error message is here.
Web fonts are disabled: unable to use embedded PDF fonts. viewer.mjs:13745:17
分離された Cookie またはストレージアクセスが “https://www.jma.go.jp/jma/press/2507/04a/20250704_asosan.pdf” に提供されました。これはサードパーティのコンテキスト内で読み込まれ、動的状態分離が有効なためです。 pdf.mjs:10872:22
(In English, Isolated cookie or storage access was provided to “https://www.jma.go.jp/jma/press/2507/04a/20250704_asosan.pdf” because it is loaded within a third-party context and dynamic state isolation is enabled. pdf.mjs:10872:22)
PDF c8e728554e650f243ca1e325387ebd45 [1.4 JUST PDF 4 / -] (PDF.js: 5.2.183 [3f1ecc1ba]) viewer.mjs:14280:13
Warning: getPathGenerator - ignoring character: "Error: Requesting object that isn't resolved yet BIZUD�S�V�b�N_path_阿.". pdf.mjs:323:13
Warning: getPathGenerator - ignoring character: "Error: Requesting object that isn't resolved yet BIZUD�S�V�b�N_path_蘇.". pdf.mjs:323:13
Warning: getPathGenerator - ignoring character: "Error: Requesting object that isn't resolved yet BIZUD�S�V�b�N_path_山.". pdf.mjs:323:13
continued...
Continued are same mean messages, that fonts (example above "BIZUD�S�V�b�N"(mojibake)) and last letters (example above "阿","蘇","山") are different.