diff --git a/Cargo.lock b/Cargo.lock
index 00a87868e2..91b05107d9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -103,25 +103,10 @@ dependencies = [
  "bitflags",
 ]
 
-[[package]]
-name = "audio_thread_priority"
-version = "0.22.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "407b1b70ad4072a4ff430679b331450166b56631091d6ba46a885cf427392055"
-dependencies = [
- "cfg-if",
- "dbus",
- "libc",
- "log",
- "mach",
- "winapi 0.3.7",
-]
-
 [[package]]
 name = "audioipc"
 version = "0.2.4"
 dependencies = [
- "audio_thread_priority",
  "bincode",
  "bytes 0.4.9",
  "cc",
@@ -148,7 +133,6 @@ dependencies = [
 name = "audioipc-client"
 version = "0.4.0"
 dependencies = [
- "audio_thread_priority",
  "audioipc",
  "cubeb-backend",
  "futures",
@@ -161,7 +145,6 @@ dependencies = [
 name = "audioipc-server"
 version = "0.2.3"
 dependencies = [
- "audio_thread_priority",
  "audioipc",
  "cubeb-core",
  "error-chain",
@@ -1659,7 +1642,6 @@ dependencies = [
 name = "gkrust-shared"
 version = "0.1.0"
 dependencies = [
- "audio_thread_priority",
  "audioipc-client",
  "audioipc-server",
  "authenticator",
diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index bb10ef9aa8..a8e659e0ed 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -109,9 +109,7 @@
 #include "GMPServiceChild.h"
 #include "nsIStringBundle.h"
 #include "Geolocation.h"
-#include "audio_thread_priority.h"
 #include "nsIConsoleService.h"
-#include "audio_thread_priority.h"
 #include "nsIURIMutator.h"
 #include "nsIInputStreamChannel.h"
 #include "nsFocusManager.h"
@@ -1689,9 +1687,7 @@ mozilla::ipc::IPCResult ContentChild::RecvSetProcessSandbox(
   } else {
     // Pre-start audio before sandboxing; see bug 1443612.
     if (StaticPrefs::media_cubeb_sandbox()) {
-      if (atp_set_real_time_limit(0, 48000)) {
-        NS_WARNING("could not set real-time limit at process startup");
-      }
+      NS_WARNING("could not set real-time limit at process startup");
       InstallSoftRealTimeLimitHandler();
     } else {
       Unused << CubebUtils::GetCubebContext();
diff --git a/dom/media/GraphRunner.cpp b/dom/media/GraphRunner.cpp
index 7fbafef812..6548528ad3 100644
--- a/dom/media/GraphRunner.cpp
+++ b/dom/media/GraphRunner.cpp
@@ -13,7 +13,6 @@
 #include "nsISupportsImpl.h"
 #include "prthread.h"
 #include "Tracing.h"
-#include "audio_thread_priority.h"
 
 namespace mozilla {
 
@@ -95,9 +94,6 @@ auto GraphRunner::OneIteration(GraphTime aStateEnd, GraphTime aIterationEnd,
 }
 
 NS_IMETHODIMP GraphRunner::Run() {
-  atp_handle* handle =
-      atp_promote_current_thread_to_real_time(0, mGraph->GraphRate());
-
   nsCOMPtr<nsIThreadInternal> threadInternal = do_QueryInterface(mThread);
   threadInternal->SetObserver(mGraph);
 
@@ -119,10 +115,6 @@ NS_IMETHODIMP GraphRunner::Run() {
     mMonitor.Notify();
   }
 
-  if (handle) {
-    atp_demote_current_thread_from_real_time(handle);
-  }
-
   dom::WorkletThread::DeleteCycleCollectedJSContext();
 
   return NS_OK;
diff --git a/dom/media/UnderrunHandlerLinux.cpp b/dom/media/UnderrunHandlerLinux.cpp
index af5c84538e..a0140b3fc9 100644
--- a/dom/media/UnderrunHandlerLinux.cpp
+++ b/dom/media/UnderrunHandlerLinux.cpp
@@ -9,7 +9,6 @@
 
 #include <mozilla/Sprintf.h>
 #include <mozilla/Atomics.h>
-#include "audio_thread_priority.h"
 
 namespace mozilla {
 
@@ -57,21 +56,8 @@ void InstallSoftRealTimeLimitHandler() {
 }
 
 void DemoteThreadFromRealTime() {
-  atp_thread_info* info = atp_get_current_thread_info();
-  if (!info) {
-    NS_WARNING("Could not get current thread info when demoting thread.");
-    return;
-  }
-  int rv = atp_demote_thread_from_real_time(info);
-  if (rv) {
-    NS_WARNING("Could not demote thread from real-time.");
-    return;
-  }
-  rv = atp_free_thread_info(info);
-  if (rv) {
-    NS_WARNING("Could not free atp_thread_info struct");
-  }
-  gRealtimeLimitReached = false;
+  NS_WARNING("Could not get current thread info when demoting thread.");
+  return;
 }
 
 }  // namespace mozilla
diff --git a/dom/media/moz.build b/dom/media/moz.build
index 3c02e55139..0b0d3b769b 100644
--- a/dom/media/moz.build
+++ b/dom/media/moz.build
@@ -104,7 +104,6 @@ XPIDL_SOURCES += [
 XPIDL_MODULE = 'dom_media'
 
 EXPORTS += [
-    '../../third_party/rust/audio_thread_priority/audio_thread_priority.h',
     'ADTSDecoder.h',
     'ADTSDemuxer.h',
     'AsyncLogger.h',
diff --git a/media/audioipc/audioipc/Cargo.toml b/media/audioipc/audioipc/Cargo.toml
index 20bc001093..59c6941adc 100644
--- a/media/audioipc/audioipc/Cargo.toml
+++ b/media/audioipc/audioipc/Cargo.toml
@@ -19,7 +19,6 @@ serde = "1.*.*"
 serde_derive = "1.*.*"
 tokio = "0.1"
 tokio-io = "0.1"
-audio_thread_priority = "0.22"
 
 [target.'cfg(unix)'.dependencies]
 iovec = "0.1"
diff --git a/media/audioipc/audioipc/src/messages.rs b/media/audioipc/audioipc/src/messages.rs
index 069cd592a8..ff797cf5cd 100644
--- a/media/audioipc/audioipc/src/messages.rs
+++ b/media/audioipc/audioipc/src/messages.rs
@@ -6,7 +6,6 @@
 use crate::PlatformHandle;
 use crate::PlatformHandleType;
 #[cfg(target_os = "linux")]
-use audio_thread_priority::RtPriorityThreadInfo;
 use cubeb::{self, ffi};
 use std::ffi::{CStr, CString};
 use std::os::raw::{c_char, c_int, c_uint};
@@ -209,9 +208,6 @@ pub enum ServerMessage {
     StreamSetVolume(usize, f32),
     StreamGetCurrentDevice(usize),
     StreamRegisterDeviceChangeCallback(usize, bool),
-
-    #[cfg(target_os = "linux")]
-    PromoteThreadToRealTime([u8; std::mem::size_of::<RtPriorityThreadInfo>()]),
 }
 
 // Server -> Client messages.
@@ -241,9 +237,6 @@ pub enum ClientMessage {
     StreamCurrentDevice(Device),
     StreamRegisterDeviceChangeCallback,
 
-    #[cfg(target_os = "linux")]
-    ThreadPromoted,
-
     Error(c_int),
 }
 
diff --git a/media/audioipc/client/Cargo.toml b/media/audioipc/client/Cargo.toml
index 82c874e013..eaf9a62cc7 100644
--- a/media/audioipc/client/Cargo.toml
+++ b/media/audioipc/client/Cargo.toml
@@ -9,7 +9,6 @@ description = "Cubeb Backend for talking to remote cubeb server."
 edition = "2018"
 
 [dependencies]
-audio_thread_priority = "0.22"
 audioipc = { path="../audioipc" }
 cubeb-backend = "0.6.0"
 futures = { version="0.1.18", default-features=false, features=["use_std"] }
diff --git a/media/audioipc/client/src/context.rs b/media/audioipc/client/src/context.rs
index 7441d0c0e0..96e3539831 100644
--- a/media/audioipc/client/src/context.rs
+++ b/media/audioipc/client/src/context.rs
@@ -6,10 +6,6 @@
 use crate::stream;
 use crate::{assert_not_in_callback, run_in_callback};
 use crate::{ClientStream, AUDIOIPC_INIT_PARAMS};
-#[cfg(target_os = "linux")]
-use audio_thread_priority::get_current_thread_info;
-#[cfg(not(target_os = "linux"))]
-use audio_thread_priority::promote_current_thread_to_real_time;
 use audioipc::codec::LengthDelimitedCodec;
 use audioipc::frame::{framed, Framed};
 use audioipc::platformhandle_passing::{framed_with_platformhandles, FramedWithPlatformHandles};
@@ -77,32 +73,6 @@ impl ClientContext {
     }
 }
 
-#[cfg(target_os = "linux")]
-fn promote_thread(rpc: &rpc::ClientProxy<ServerMessage, ClientMessage>) {
-    match get_current_thread_info() {
-        Ok(info) => {
-            let bytes = info.serialize();
-            // Don't wait for the response, this is on the callback thread, which must not block.
-            rpc.call(ServerMessage::PromoteThreadToRealTime(bytes));
-        }
-        Err(_) => {
-            warn!("Could not remotely promote thread to RT.");
-        }
-    }
-}
-
-#[cfg(not(target_os = "linux"))]
-fn promote_thread(_rpc: &rpc::ClientProxy<ServerMessage, ClientMessage>) {
-    match promote_current_thread_to_real_time(0, 48000) {
-        Ok(_) => {
-            info!("Audio thread promoted to real-time.");
-        }
-        Err(_) => {
-            warn!("Could not promote thread to real-time.");
-        }
-    }
-}
-
 fn register_thread(callback: Option<extern "C" fn(*const ::std::os::raw::c_char)>) {
     if let Some(func) = callback {
         let thr = thread::current();
@@ -121,7 +91,6 @@ fn promote_and_register_thread(
     rpc: &rpc::ClientProxy<ServerMessage, ClientMessage>,
     callback: Option<extern "C" fn(*const ::std::os::raw::c_char)>,
 ) {
-    promote_thread(rpc);
     register_thread(callback);
 }
 
diff --git a/media/audioipc/server/Cargo.toml b/media/audioipc/server/Cargo.toml
index 3171873881..3363f143c7 100644
--- a/media/audioipc/server/Cargo.toml
+++ b/media/audioipc/server/Cargo.toml
@@ -9,7 +9,6 @@ description = "Remote cubeb server"
 edition = "2018"
 
 [dependencies]
-audio_thread_priority = "0.22"
 audioipc = { path = "../audioipc" }
 cubeb-core = "0.6.0"
 futures = "0.1.18"
diff --git a/media/audioipc/server/src/lib.rs b/media/audioipc/server/src/lib.rs
index 4ae9dc3ddc..ad1e1297d5 100644
--- a/media/audioipc/server/src/lib.rs
+++ b/media/audioipc/server/src/lib.rs
@@ -9,7 +9,6 @@ extern crate error_chain;
 #[macro_use]
 extern crate log;
 
-use audio_thread_priority::promote_current_thread_to_real_time;
 use audioipc::core;
 use audioipc::platformhandle_passing::framed_with_platformhandles;
 use audioipc::rpc;
@@ -64,12 +63,6 @@ fn run() -> Result<ServerWrapper> {
     let callback_thread = core::spawn_thread(
         "AudioIPC Callback RPC",
         || {
-            match promote_current_thread_to_real_time(0, 48000) {
-                Ok(_) => {}
-                Err(_) => {
-                    debug!("Failed to promote audio callback thread to real-time.");
-                }
-            }
             trace!("Starting up cubeb audio callback event loop thread...");
             Ok(())
         },
diff --git a/media/audioipc/server/src/server.rs b/media/audioipc/server/src/server.rs
index 33b8ecdc9f..2f8ea52245 100644
--- a/media/audioipc/server/src/server.rs
+++ b/media/audioipc/server/src/server.rs
@@ -3,8 +3,6 @@
 // This program is made available under an ISC-style license.  See the
 // accompanying file LICENSE for details
 
-#[cfg(target_os = "linux")]
-use audio_thread_priority::{promote_thread_to_real_time, RtPriorityThreadInfo};
 use audioipc;
 use audioipc::codec::LengthDelimitedCodec;
 use audioipc::frame::{framed, Framed};
@@ -611,20 +609,6 @@ impl CubebServer {
                     enable,
                 )
                 .unwrap_or_else(error),
-
-            #[cfg(target_os = "linux")]
-            ServerMessage::PromoteThreadToRealTime(thread_info) => {
-                let info = RtPriorityThreadInfo::deserialize(thread_info);
-                match promote_thread_to_real_time(info, 0, 48000) {
-                    Ok(_) => {
-                        info!("Promotion of content process thread to real-time OK");
-                    }
-                    Err(_) => {
-                        warn!("Promotion of content process thread to real-time error");
-                    }
-                }
-                ClientMessage::ThreadPromoted
-            }
         };
 
         trace!("process_msg: req={:?}, resp={:?}", msg, resp);
diff --git a/toolkit/library/rust/shared/Cargo.toml b/toolkit/library/rust/shared/Cargo.toml
index 01040fad2d..16e2251fc7 100644
--- a/toolkit/library/rust/shared/Cargo.toml
+++ b/toolkit/library/rust/shared/Cargo.toml
@@ -40,7 +40,6 @@ storage = { path = "../../../../storage/rust" }
 bookmark_sync = { path = "../../../components/places/bookmark_sync", optional = true }
 shift_or_euc_c = "0.1.0"
 chardetng_c = "0.1.1"
-audio_thread_priority = "0.22"
 mdns_service = { path="../../../../media/mtransport/mdns_service", optional = true }
 neqo_glue = { path = "../../../../netwerk/socket/neqo_glue" }
 rlbox_lucet_sandbox = { version = "0.1.0", optional = true }
diff --git a/toolkit/library/rust/shared/lib.rs b/toolkit/library/rust/shared/lib.rs
index 10c96aa1e7..539dbf9c55 100644
--- a/toolkit/library/rust/shared/lib.rs
+++ b/toolkit/library/rust/shared/lib.rs
@@ -50,7 +50,6 @@ extern crate xpcom;
 #[cfg(feature = "new_xulstore")]
 extern crate xulstore;
 
-extern crate audio_thread_priority;
 
 #[cfg(feature = "webrtc")]
 extern crate mdns_service;