Is this a problem when you are viewing the file in Firefox's built-in PDF Viewer and using its download button, or when you are using a download button in a web page?

I've seen this problem occur when the server is pushing a different file name than the actual file name (for example, the file name is pdf.asp?id=12345 but the server is sending the name Annual Report.pdf in the headers sent with the file). I'm not aware of a workaround for the user, but for what it's worth, it is easy to fix on the server by replacing the spaces with %20 (the standard substitution used in web addresses).

No, its not that. If you know Charter Communications MyAccount, you can download a pdf of your current statement and the name has a space in it. That 'Click' goes to what looks like is a Windows 'Save" PopUp routine with the filename and where to save it. Under Internet Explorer, the name is completely showing, including a space in the file name. Under the Firefox, only the first few letters showing, up to the space. I've used that routine in C++ a decade ago myself, but I don't know why its parsed differently.

I don't know if this will help.

PDF Download https://addons.mozilla.org/en-US/firefox/addon/pdf-download/ Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.

I tried your pdf-download addon, but ,sorry, didn't fix to problem. I don't think that the .pdf is the problem, but the parsing of any file Save. Thanks, I've been printing a web page with CutePDF. I'll check out the Web-to-PDF.

Apparently there is an extension to work around this. I haven't tried it myself. See:

http://kb.mozillazine.org/Filenames_with_spaces_are_truncated_upon_download

Thanks very much. The truncfix worked and saved the file's full name with the space.