PDF's from Internet defaulted to Quicktime

Recently, when I get emails using Comcast Xfinity as my email provider and Safari as my browser the PDF files I'm trying to access are opening with Quicktime as the default.  I don't know how to fix this problem so that they default to Preview like they have always done in the past.  I even randomly tried to open PDFs on different websites and sometimes they open in Quicktime and other websites don't.  I'm baffled!  Anyone have this problem?  It also happens when I use Firefox.
How did Quicktime become the default to open PDF's?

If these are downloaded PDFs, do a Get Info (Command-I) on one of them, and in the middle of the page set the "Open with:" selector to Preview.
Then click the Change All button in the same section of Get Info.

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