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Facedown is not compatible with your version of Firefox

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MikeAlan
MikeAlan
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I have just installed Firefox on my Windows 10 pro computer. I have tried to install the AddOn: FaceDown but I get the following error message: This add-on is not compatible with your version of Firefox? Why cant I install Facedown?

I have just installed Firefox on my Windows 10 pro computer. I have tried to install the AddOn: FaceDown but I get the following error message: This add-on is not compatible with your version of Firefox? Why cant I install Facedown?

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James
James
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Facedown is a legacy extension for the old Firefox 56.0 and earlier Releases. Last update from the extension author was June 12, 2015.

https://addons.mozilla.org/firefox/addon/facedown/versions/