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Firefox doesn't do what I've set it to do with downloads

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I've set Firefox to open PDF files in the PDF viewer that I use, and I've set it to "do this automatically for files like this from now on," yet every time I go to download a pdf, I get the message window popping up asking what I want to do with this file. I've gone through the troubleshooting of deleting the handlers.json file that the Support archives recommended trying, but it hasn't changed things.

I've set Firefox to open PDF files in the PDF viewer that I use, and I've set it to "do this automatically for files like this from now on," yet every time I go to download a pdf, I get the message window popping up asking what I want to do with this file. I've gone through the troubleshooting of deleting the handlers.json file that the Support archives recommended trying, but it hasn't changed things.

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What O/S are you using?

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Windows 10, 64-bit version.