FWIW, I tried to reproduce, but couldn't immediately. Specifically: I created two local PDF files (from a PDF printout of example.org), with these filenames: > \033橡\033Super Visual Formade Print - 201807.pdf.pdf > ̽橡̽test.pdf (The second one is using the character that I think corresponds to \033, which from http://www.fileformat.info/info/unicode/char/033d/browsertest.htm is ̽) I was able to view & print both files just fine in Firefox's built-in PDF viewer (in Nightly on Linux). Any chance you can create/attach a PDF file (or filename) that reliably reproduces the issue for you?
Bug 1519076 Comment 1 Edit History
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FWIW, I tried to reproduce, but couldn't immediately. Specifically: I created two local PDF files (from a PDF printout of example.org), with these filenames: > \033橡\033Super Visual Formade Print - 201807.pdf.pdf > ̽橡̽test.pdf (The second one is using the character that I think corresponds to \033, which according to http://www.fileformat.info/info/unicode/char/033d/browsertest.htm is: ̽) I was able to view & print both files just fine in Firefox's built-in PDF viewer (in Nightly on Linux). Any chance you can create/attach a PDF file (or filename) that reliably reproduces the issue for you?