Linux-SWAT
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Check this article to know how to disable JS in PDFs:

Firefox 88 Enables JavaScript Embedded In PDFs By Default - Slashdot
ewhac writes: Firefox has long had a built-in PDF viewer, allowing users to view PDF files in the browser without having to install a third-party application. In addition to the other weird things PDF files can contain, one of them is JavaScript. Putatively offered as a way to create...
news.slashdot.org