# List of Fenix Threads To profile background threads using the Firefox Profiler, you need to specify their names. It uses a case-insensitive substring match, e.g. specifying `default` will match all threads in the kotlin default dispatcher which have a name like, `DefaultDispatcher-worker-*`. This document is a list of the threads in fenix (via `ThreadGroup.list()` as of Mar 2022) to make using this functionality easier: ``` AutoSave-thread-1 BrowserIcons-thread-1 BrowserIcons-thread-2 BrowserIcons-thread-3 BrowserStore-thread-1 ConnectivityThread DefaultDispatcher-worker-1 DefaultDispatcher-worker-2 DefaultDispatcher-worker-3 DefaultDispatcher-worker-4 DefaultDispatcher-worker-5 DefaultDispatcher-worker-6 DefaultDispatcher-worker-7 DefaultDispatcher-worker-8 FinalizerDaemon FinalizerWatchdogDaemon FxaAccountManager-thread-1 Gecko GeckoInputConnection GleanAPIPool HeapTaskDaemon HistoryMetadataService-thread-1 LeakCanary-Heap-Dump NimbusDbScope-thread-1 NimbusFetchScope-thread-1 PlacesStorageWriteScope-thread-1 ReferenceQueueDaemon ThumbnailStorage-thread-1 ThumbnailStorage-thread-2 ThumbnailStorage-thread-3 WM.task-1 WM.task-2 WM.task-3 WM.task-4 androidx.work-1 androidx.work-2 arch_disk_io_0 arch_disk_io_1 arch_disk_io_2 arch_disk_io_3 glean.MetricsPingScheduler main pool-23-thread-1 pool-9-thread-1 pool-9-thread-2 queued-work-looper ``` Note that `arch_disk_io_*` represents the kotlin io dispatcher.