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How do I stop mp3 and mp4 files from automatically opening after they are finished downloading ?

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Every time I convert a video to mp3 or mp4 and then download it, the file will automatically open and play. How can I stop it from automatically opening and playing.

Many thanks.

Every time I convert a video to mp3 or mp4 and then download it, the file will automatically open and play. How can I stop it from automatically opening and playing. Many thanks.

Chosen solution

in the URL bar type: about:preferences#applications

search to find the MP4/MPEG4 and use the dropdown box to switch it to something else like "Always Ask"

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Chosen Solution

in the URL bar type: about:preferences#applications

search to find the MP4/MPEG4 and use the dropdown box to switch it to something else like "Always Ask"

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If the above doesn't handle your specific downloads:

Is the media opening in its own tab? Firefox calls that the "stand alone" player and you can disable the stand-alone player if you do not need it for other purposes. Here's how:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste stand and pause while the list is filtered

(3) Double-click the media.play-stand-alone preference to switch the value from true to false