diff --git a/dev/ucsc/hub.html b/dev/ucsc/hub.html
index bd33af5d3..3229eab08 100644
--- a/dev/ucsc/hub.html
+++ b/dev/ucsc/hub.html
@@ -39,20 +39,17 @@
     }
 
     const hub = await Hub.loadHub("https://hgdownload.soe.ucsc.edu/hubs/GCA/009/914/755/GCA_009914755.4/hub.txt", hubOptions)
-    const ref = hub.getGenomeConfig()
 
     const igvConfig = {
-        reference: ref
+        reference: hub.getGenomeConfig()
     }
 
-    // for(let tc of hub.getTrackConfigurations()) {
-    //     for(let t of tc.tracks) {
-    //         if(t.url.endsWith("undefined")) console.log(`${tc.label}  ${t.name}  ${t.url}`)
-    //     }
-    // }
-
     const browser = await igv.createBrowser(document.getElementById('igvDiv'), igvConfig)
 
+    browser.on('genomechange', (genome) => {
+        console.log(genome.getTrackConfigurations())
+    })
+
     const selector = document.getElementById("select")
     selector.addEventListener("change", () => document.getElementById("hub-input").value = selector.value)
 
diff --git a/js/browser.js b/js/browser.js
index ea42de7e8..163df77b0 100755
--- a/js/browser.js
+++ b/js/browser.js
@@ -702,6 +702,10 @@ class Browser {
             throw new Error(`Cannot set initial locus ${locus}`)
         }
 
+        if(genomeChange) {
+            this.fireEvent('genomechange', [genome])
+        }
+
         if (genomeChange && this.circularView) {
             this.circularView.setAssembly({
                 name: this.genome.id,