Notice "blank" on new posts visit sometimes

[PracticalBot]

I can't reproduce this, but on some rare occasions when I visit my forum and use the New Posts link (happens in any case when no new posts are available) then I get a popup in Firefox stating "Blank" just as if you clicked something to download.
So yes, I can select to either download it or open in with something.

When I select to open it in Firefox it shows me a blank page with this url:
Code:

file:///C:/Users/Tiger/AppData/Local/Temp/KT68TzG5.htm

Investigating this file in this temp...

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