God bless Firefox v129

web/src/components/Portrait/PortraitForm/PortraitForm.tsx

@@ -95,11 +95,15 @@ const PortraitForm = (props: PortraitFormProps) => {
     deleteFile(fileIdRef.current)
 
     if (navigator.userAgent.match(/firefox|fxios/i)) {
-      // Dear Mozilla, please implement keepalive on Firefox
-      // Sincerely, everybody
-      const time = Date.now()
-      while (Date.now() - time < 500) {
-        /* empty */
+      const firefoxVer = Number(navigator.userAgent.match(/Firefox\/(\d+)/)[1])
+
+      // One day dom.fetchKeepalive.enabled becomes true by default... until then!
+      if (firefoxVer < 129) {
+        const time = Date.now()
+
+        while (Date.now() - time < 500) {
+          /* empty */
+        }
       }
     }
   }