Hello, I am a software developer and installer creator. I have nine years of experience in programming. I can create the installer to install the extensions for the browsers. I assume it is only for Firefox and Chrome as you said. Furthermore, the installer will show a dialog allowing the end-user to select which browser's extension that needs to be installed. The user can select both or just one. I rest-assure that I will complete the work on time and deliver you the completed work to your satisfaction.