I'm using Sublime Text 3 and installed browsersync package for live reloading.
When I quit from Sublime and close liveserver app in my browser and try to open new liveserver with react start command I get a message that say: "Something is already running on port 3000." Then I check localhost:3000 and the browser still sync to Sublime I don't know how to turn off liveserver in port 3000 ?

please help me
I assume that this is the plugin you're using. Unfortunately, the plugin has been abandoned for 5 years, and the way it's written, there is no method for killing the node server once you're done with the plugin. From the Windows command line, this:
should do the trick, but you'll have to run it manually. Alternatively, you can use Task Manager to kill any
node-windows.exeprocesses.