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I need help sizing & uploading a theme for Firefox.

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I'm trying to upload a new, customized theme for my Firefox browser & I don't know how to resize my image(s) to meet the "3000 x 200 pixel" requirement for my images.

I'm trying to upload a new, customized theme for my Firefox browser & I don't know how to resize my image(s) to meet the "3000 x 200 pixel" requirement for my images.

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Best is to ask advice at the Add-ons forum. This forum is about issues with Firefox and that doesn't include developing lightweight theme (Persona).