No one wants to use your malware extensions.
How do i promote chrome extension? and where?
all browser site provide add on and extention support add your extention on there list
Try to use different platforms, forums, blogs and try to describe you extencions for the people. Also try to use all business utilities for that cuz it's some kind of business you do. At the same time try to use all of google analytics crm (in this blog describe how to use that) www.owox.com/blog/articles/how-to-marry-up-your-crm-with-goo In this way it will be more faster.