Why do printable coloring PDF pages sometimes not load correctly in Firefox mobile?

Hi everyone, I recently started using Firefox on Android to download and print coloring pages for my kids from websites like [https://kleurplatenteprinten.nl/ https://kleurplatenteprinten.nl/] https://kleurplatenteprinten.nl/ , but sometimes the PDF files either open blank, keep loading forever, or do not download properly. The same files seem to work normally in Chrome, so I’m wondering if this could be related to Firefox settings, built-in PDF handling, or a mobile download permission issue. I already tried: Clearing browser cache Switching between Wi-Fi and mobile data Disabling tracking protection for the site but the issue still happens occasionally. Has anyone experienced similar problems with printable PDF pages or downloads in Firefox mobile? Any suggestions would be appreciated.