Hi, I am an expert at chrome extensions and you can check my profile and read my clients review about it. I have done several such projects before.
1. For the first task I can provide you with a WYSIWYG Html editor and it will generate html code.
2. For the shared canned response we need to build a database and manage it from there.
3. This should be easy, I will need to check it once.
This is also my day job so i normally do similar stuffs at my work. I have more than enough expertise to get your project done.
This is a very simple project and I can easily do it for you.
I would be glad to help you out. Looking forward to work with you.
Thank-you