Any gotchas or protips about building a Chrome extension that I should know?

I'm building out a chrome extension for a side project, and it's actually been pretty amazing. In terms of coding for the web it's pretty dreamy : only one browser to consider, lots of documentation, only desktop ( for now ), etc.

I'm probably 75% of the way there ( or so I think ), but I feel like I have gotten off too easy at this point. If you have any protips or gotchas to be aware of when launching a Chrome extension I'd love to hear them.