PHP files downloaded?

This might be a problem with my browser (firefox), but I've not noticed it in any other site.
It's quite rare, but sometimes when I click on a link, instead of the file being opened in the browser a save dialogue appears, as if it was a file that can't be opened in the browser. If I click cancel and try again it works right.
It's quite rare, but sometimes when I click on a link, instead of the file being opened in the browser a save dialogue appears, as if it was a file that can't be opened in the browser. If I click cancel and try again it works right.
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