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Saving files Firefox inserts file extension even after I've delete it in the save dialog

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Mac using Firefox 76.0.1

This problem started with Firefox 76

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Are you generating something like this:

Content-Disposition: attachment;filename="Test Widget Rename.json";

You could double-check that Firefox received it using the Network Monitor, if the download opens in the same tab. Note that the monitor doesn't start logging until you open it:

   "3-bar" menu button > Web Developer > Network
   (menu bar) Tools > Web Developer > Network
   (Mac) Command+Alt+e
   (Windows) Ctrl+Shift+e 

When you click the request for the download, the Response Headers usually are displayed in the right side by default but, if another panel is selected, click Headers.

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