How to create browser add-ons for multiple browsers?

Hello Friends,

I want to create add-ons for multiple browser. can anyone of you please let me know In which language i need to create and how to create?

Any specific language avaialble?

Thank you so much.

Thanks,

Priya

Hello Friends,

I want to create an add-ons like toolbar. I am able to install it and uninstall it. that should be applicable for all the browsers.

Which language i need to use?( Java/JS/C++)
how to create this?
Please give me some steps?

Thanks,

Priya