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Fully Customize Browser

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I want to run a web app as desktop app in my computer. In this case I want to customize Mozilla browser to give a desktop view. I want full control on the GUI of Mozilla browser. One thing is very important that I want this customize Mozilla browser dedicatedly for this app only, another Mozilla browser will be run for browsing. Now my question is, is it possible? If possible then how can I do it and which technology/ technologies should I know?

I want to run a web app as desktop app in my computer. In this case I want to customize Mozilla browser to give a desktop view. I want full control on the GUI of Mozilla browser. One thing is very important that I want this customize Mozilla browser dedicatedly for this app only, another Mozilla browser will be run for browsing. Now my question is, is it possible? If possible then how can I do it and which technology/ technologies should I know?

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The Mozilla Developer Network website is over here: https://developer.mozilla.org/en-US/