Are there any successful products/business models for Chrome extensions. Any that you might have seen?
GMass is a pretty popular one: https://www.gmass.co/
There's actually an IndieHackers post for it: https://www.indiehackers.com/interview/how-i-hit-115k-mo-with-a-status-quo-improvement-c45d11ad17
And the browser plugin section on interviews should list more: https://www.indiehackers.com/interviews/page/1?platform=browser
I found AeroLeads (a bootstrap startup), which has the most fascinating business model.
It is the most rapidly growing chrome extension on the web. The extension is majorly used by small and medium size company who are involved in B2B sales.
The unique selling point of this business is that it can be used on the top of Angellist, CrunchBase, LinkedIn, etc. and provide highly accurate data which most of the similar tools fail to do so.
Also, the average revenue is around $30,000/month and in future, it will surely be a major player in the prospect generation and sales segment
I'd suggest doing research and looking for some info that has already been done for us - https://www.tomsguide.com/us/pictures-story/283-best-google-chrome-extensions.html, https://www.oberlo.com/blog/google-chrome-extensions, https://twitgoo.com/best-google-chrome-extensions/. It seems that people are aware of their privacy, so everything related to that should be good, I guess.
Are you doing research for a extension you are building? I've currently facing the same question. Let me know if you are interested in having a chat.