How can I maximise the income?
Although the most reasonable approach will be to build large use base, our approach is somewhat controversial and uncommon. We are literally trying to win customers one by one.
In order to do that, you would need to focus all your efforts in 2 main areas - being at your users disposal as much as possible and constantly improving your product based on their feedback.
We made ourselves available to be contacted through several means:
— customer support chat that can be accessed directly in the extension window
— chat widget on our website
— e-mail form on our website
— the support page on Chrome Webstore
— Twitter - follow us
Once we got contacted with an issue or a suggestion, we try to respond within couple of hours (if the user is in our timezone). We DON’T use bots to guide the users or to interact with them. After identifying what needs to be improved, we try to do it as fast as possible and push an update (if necessary).
It sounds simple and it really is… The only hard thing is to actually keep up and be flexible.No shortcuts, no hacks - pure hard work.
P.S. Have a look at a decent guide from Mozilla on that topic.
Make money from browser extensions - Mozilla | MDN