Why Firefox V19.0.2 open two instances of a page when I load the page fron a folder on my PC?

If I save a web page to a folder on my PC and then click on it to see... Firefox opens two identical copies of the html file in two separate windows. Previous versions of Firefox has never done this, why V19.0.2 to do this and how then I stop doing that?

I noticed information about resetting Firefox... I did, and now, the problem disappeared... I'll try to reset (now that I know how) to solve problems in the future. Thank you all.

Tags: Firefox

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