"In Sublime select Fireplay and follow the instruction" could be more specific. You can also just use cmd+shift+R
"Select to connect to existing Firefox or Firefox OS" - it doesn't work like that actually
"In your Sublime Text's packages folder, in fireplay.sublime-settings set fireplay_firefox to true" sounds confusing
Can fireplay.sublime-settings be renamed to have a .json at the end?
Once you've done the above... how do you use this? There's no mention to opening a project with an app source code, or no mention that when you save some files the app will be repushed. How do you see the console logs too?