disable update check:

{
	"font_size": 16,
	"font_face": "TamzenForPowerline",
        "font_options": ["no_antialias"],
	"show_encoding": true,
	"update_check": false,
	"word_wrap": true,
	"gpu_window_buffer": false
}

gpu_window_buffer fixed the flickering issue: https://forum.sublimetext.com/t/screen-flickering/43671

• monokai JSON+ (Change the color schema from menu)
• Pretty JSON
• JsPrettier
• GitGutter
• Autohotkey