After taking a break from working on another project, I decided to explore this idea. I've been a user of https://tryshift.com for a while and the email switching feature is really good. I didn't like how they were trying to become the only browser you use.
After learning this type of thing was possible to be built as a browser extension, I wanted to try building it.
Instead of going heads down and writing a ton of code first, I'm validating the idea. I've set up a landing page at https://tidyworkspace.com with design mockups and an email drop. I'm going to various communities to get design feedback and asking a lot of connections for feedback.
I already have three other people who are excited about the product. I'm gonna try to get to ten before building anything.