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why is firefox opening a folder and disc every time i launch it

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why is firefox opening a folder and disc onto my desktop every time i launch it

This happened

Every time Firefox opened

== with the new version

why is firefox opening a folder and disc onto my desktop every time i launch it == This happened == Every time Firefox opened == with the new version

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Let's start simple. Are you sure you are not clicking on the firefox dmg file? See How to download and install Firefox on Mac