I expected the debug button in the app manager to update the application with the latest code, before starting the debugging session. It's also a feedback I got from developers, as it's usually the case with other tools. Right now, if you want to debug a Firefox OS application which you just change the code, you need to click update, and after debug. I don't know if that would be a better workflow to just having to use debug as debug would always fetch the latest version of the application.

I agree with Fred. We have seen many developers make this mistake.

The interesting / unfortunate thing here is that "Debug" does install the app if it's *not* currently running. It's a bit of a UX challenge, since it's possible someone may want to debug the currently installed version on device, while another wants to edit the copy on their host machine and debug that after it's installed. I am hopeful that our upcoming UX rework can address this.

For me, what we miss the most from the current UX is an update button right into the toolbox, so that you don't have to go back to the Apps panel and do update/debug.

I believe the new UI solves this problem. See https://wiki.mozilla.org/DevTools/WebIDE