SPFx Extension
Debugging SPFx Extension ?debugManifestsFile=https://localhost:4321/temp/manifests.js&loadSPFX=true&customActions={" 8fda850f-89bb-4fba-9890-907a744abf4c ":{"location":"ClientSideExtension.ApplicationCustomizer","properties":{}}} 8fda850f-89bb-4fba-9890-907a744abf4c => Serve.Json => "CustomActions":{"8fda850f-89bb-4fba-9890-907a744abf4c":{}}