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How do I upload/use my own theme I created?

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I created my own design on photoshop and mimicked my theme now just changed the graphic, how do I use/upload that so I can use that image/design as my theme?

I created my own design on photoshop and mimicked my theme now just changed the graphic, how do I use/upload that so I can use that image/design as my theme?

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It probably matters whether it is a full theme or a Persona...

Might I suggest you check out the Add-ons forum to see whether they have the answers?

https://forums.mozilla.org/addons/index.php