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How can I install the Space Fantasy theme on Firefox 40.3

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I don't have any themes available on this computer. It seems to be not available even though I have it on my other computer which is also running Firefox 40.3 which I have many themes available by default by clicking View then Toolbars the Customize.

I don't have any themes available on this computer. It seems to be not available even though I have it on my other computer which is also running Firefox 40.3 which I have many themes available by default by clicking View then Toolbars the Customize.

Chosen solution

Go to here

Click Add to Firefox, when installing done, refresh your browser.

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Chosen Solution

Go to here

Click Add to Firefox, when installing done, refresh your browser.