application/octet-stream, Pop up for inquiry to down this file when put our URL on a Firefox browser

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We have just got our Shopify store launched, but encountered a problem that we can not sort it out.

when we input our URL on a Firefox browser, there is always a pop up, inquiry a permission to download a file, which file style is 'application/octet-stream"



Anyone knows how to fix this?


Thank you so much!