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Why does Mozilla Firefox have lots of cool Themes (full) but only a limited few work on my version of Firefox?

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Just want more themes, the cool ones,please. Is it possible?

Just want more themes, the cool ones,please. Is it possible?

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Themes are created by 3rd party developers, not by Firefox. Due to unfamiliarity with the new UI and a lot of dissatisfaction with the new UI which makes creating a full theme harder, a lot of developers haven't updated their themes for Firefox 29 and later versions, or have quit doing themes.

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Chosen Solution

Themes are created by 3rd party developers, not by Firefox. Due to unfamiliarity with the new UI and a lot of dissatisfaction with the new UI which makes creating a full theme harder, a lot of developers haven't updated their themes for Firefox 29 and later versions, or have quit doing themes.