My Firefox opens in a media player how can i fix this?

I downloaded K-Lite Codec Pack and it made most of my files on my computer to open in a media player and it also changed my firefox to open in it also how can i fix it?
Thanks in advance

Sounds that that installer has grabbed a lot of file extensions and made them open in a media player.
You can try to uninstall this codec pack to see if that reverts those associations to their previous action.
Otherwise you can try to right-click a file with a changed association and use open with to change the current association to the previous program that handled it.

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