So far, the easiest way I found to avoid this "Save As" dialog popping up is to set up Firefox to always save files in Downloads.

I haven't found a good way to prevent the "Save As" dialog from popping up, or automating it from the outside. The alternative is to find what URL the doExport() function actually accesses, and to ->get() that URL directly instead.

In reply to Re: JavaScript POP up in Firefox for open with and save file dialog by Corion
in thread JavaScript POP up in Firefox for open with and save file dialog by Dnice

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