Hi,
I need to create a Add-on for firefox

I have tried the following methods and it is working fine

  1. Using XUL runner
  2. Drag and Dropping the .XPI file in the Mozilla Firefox.(using XUL, HTML,CSS and Javascript).

Can anyone tell me How to create an Add-on for Firefox using C# and JavaScript?

Thanks!

You can't. You can't use .NET to write an extension for firefox. Although you could write an extension that runs your .NET application!

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