I'm seeing the "Oops" extension conflict message
This message may pop up from time to time when you open up the sidebar or if you're using Mixmax Compose. The issue here is probably not an extension conflict - rather, Chrome made some recent changes, and it's causing a hiccup. To fix this, just refresh the browser. You may see the error message periodically - just refresh each time it pops up.
If refreshing your browser window doesn't work, you may actually have an extension conflict! Here's how to resolve an extension conflict.