Chrome and Firefox extension and Toolbar to be used with Gmail

I can do this .

have high experience in chrome and firefox ext dev, check my profile to see my past works, pm to talk more about details i have some better idea for you

Do you need to have backend app developed for managing users ? or do you have one ? explain please

I'm software engineer. You can check my portfolio : https://www.freelancer.com/u/sheratsuki.html i have completed more than 10 chrome extension project successfully. i can do : Scraping data, crawling websites, simulating user-browser actions,captcha resolution ... my proposal: inject toolbar designed with bootstrap twitter, drag & drop canned response to message box with ajax-authentication and user credentials server-side database. Contact me as son as possible. I'm free and available now.

A proposal has not yet been provided

First, I am sunsoftpro, I from VietNam. Nice to meet you! I have read your description and been interested in your project. I'm ready to discuss and do hard working so that complete great job. Please discuss requirements and terms before awarding the project.