How to create a Thunderbird theme

Hi, I would like to know how to create a Thunderbird theme. While I am happy with the default theme, a few icons on the left hand sidebar looks really old. I would like to replace them at the least. Kindly guide me in this regard.

thunderbird theme icons

PS : I am using Ubuntu 18.04

Hi @meetdilip, it looks like this page can help you get started on creating Thunderbird themes: https://developer.thunderbird.net/add-on-examples/web-extension-themes

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Thank you @caitmuenster . Will it be possible to get an unpacked default theme where I can change those icons, then build it and use it.

Not that I’m aware of. @ryanleesipes, do you know? :slight_smile:

@meetdilip You might be able to copy/paste the code from the example and use that as a starting point.

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Looks like I am stuck. I don’t know what to put in icon.png or image.png. Are they icon sprites. Would it possible that someone can give me the default theme with left hand side button replaced with font awesome or something similar ? Thanks.