Hello, I would like to report a potential bug in Mozilla Firefox related to recent updates. After downloading a PDF file and opening it directly in the browser, the tab crashes. Following this crash, it becomes impossible to open any files (regardless of file type) within the browser — every attempt results in another tab crash. The crash report cannot be reviewed, as the tab fails immediately and can only be closed. As a temporary workaround, changing the default PDF handler to an external application prevents the issue. However, this is not a viable solution for us, since some of our internal systems require PDFs to open directly in the browser after download. We have verified that this issue does NOT occur in version 148.0.2 — everything works correctly there. However, after updating to version 149.0, the problem reappears consistently. Firefox also automatically updates after synchronization, making it difficult to remain on a stable version. According to the release notes, there were changes in PDF handling in recent updates, so this may be related to a technical regression. Could you please investigate this issue or advise on a proper fix or workaround? Best regards, Daniel Mazur VanityStyle IT Specialist