Single Window Mode With Sublime Text On OSX

In OSX, editing files from finder or other applications can cause multiple instances to spawn. If you prefer everything to remain tabbed in a single window, do the following.

Open: Menu -> Preferences -> Settings - User

...and add the following, then restart the app.

{
    "open_files_in_new_window": false
}

If you have existing settings within the brackets, simply add that line (check your end of line commas for proper formatting!)