diff --git a/Cargo.lock b/Cargo.lock
index bdff4ce..3f211b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -486,6 +486,7 @@ dependencies = [
  "serde",
  "slog",
  "structopt",
+ "tempfile",
  "thiserror",
  "tokio",
  "toml",
diff --git a/fxrecord.example.toml b/fxrecord.example.toml
index 56034a6..cac2580 100644
--- a/fxrecord.example.toml
+++ b/fxrecord.example.toml
@@ -3,12 +3,14 @@ host = "127.0.0.1:8888"
 
 [fxrecorder.recording]
 ffmpeg_path = "C:\\ffmpeg\\ffmpeg.exe"
-video_size = { y = 1920, x = 1080 }
-output_size = { y = 1366, x = 768 }
+video_size = { x = 1920, y = 1080 }
+output_size = { x = 1366, y = 768 }
 frame_rate = 60
 device = "AVerMedia GC551 Video Capture"
 buffer_size = "1000M"
+minimum_recording_time_secs = 90
 
 [fxrunner]
 host = "0.0.0.0:8888"
 session_dir = "C:\\fxrunner\\sessions"
+display_size = { x = 1366, y = 768 }
diff --git a/fxrecorder/Cargo.toml b/fxrecorder/Cargo.toml
index 45b647b..b6d8330 100644
--- a/fxrecorder/Cargo.toml
+++ b/fxrecorder/Cargo.toml
@@ -19,6 +19,7 @@ libfxrecord = { path = "../libfxrecord" }
 serde = { version = "1.0.110", features = ["derive"] }
 slog = "2.5.2"
 structopt = "0.3.14"
+tempfile = "3.1.0"
 thiserror = "1.0.20"
 tokio = { version = "0.2.21", features = ["process", "tcp", "rt-threaded", "time"] }
 toml = "0.5.6"
diff --git a/fxrecorder/src/bin/main.rs b/fxrecorder/src/bin/main.rs
index 74685fb..36b180f 100644
--- a/fxrecorder/src/bin/main.rs
+++ b/fxrecorder/src/bin/main.rs
@@ -12,6 +12,7 @@ use libfxrecord::prefs::{parse_pref, PrefValue};
 use libfxrecord::{run, CommonOptions};
 use libfxrecorder::config::Config;
 use libfxrecorder::proto::RecorderProto;
+use libfxrecorder::recorder::FfmpegRecorder;
 use libfxrecorder::retry::delayed_exponential_retry;
 use slog::{error, info, Logger};
 use structopt::StructOpt;
@@ -75,7 +76,13 @@ async fn fxrecorder(log: Logger, options: Options, config: Config) -> Result<(),
         let stream = TcpStream::connect(&config.host).await?;
         info!(log, "Connected"; "peer" => config.host);
 
-        let mut proto = RecorderProto::new(log.clone(), stream);
+        // TODO: Ideally we would split new_session and resume_session into
+        //       static methods so that we do not need to specify the recorder here.
+        let mut proto = RecorderProto::new(
+            log.clone(),
+            stream,
+            FfmpegRecorder::new(log.clone(), &config.recording),
+        );
 
         proto
             .new_session(&task_id, profile_path.as_deref(), prefs)
@@ -104,7 +111,11 @@ async fn fxrecorder(log: Logger, options: Options, config: Config) -> Result<(),
 
         info!(log, "Re-connected"; "peer" => config.host);
 
-        let mut proto = RecorderProto::new(log, stream);
+        let mut proto = RecorderProto::new(
+            log.clone(),
+            stream,
+            FfmpegRecorder::new(log.clone(), &config.recording),
+        );
 
         let idle = if options.skip_idle {
             Idle::Skip
diff --git a/fxrecorder/src/lib/config.rs b/fxrecorder/src/lib/config.rs
index d10b3e8..a283f42 100644
--- a/fxrecorder/src/lib/config.rs
+++ b/fxrecorder/src/lib/config.rs
@@ -56,6 +56,9 @@ pub struct RecordingConfig {
     ///
     /// This corresponds to the `-rtbufsize` argument to `ffmpeg`.
     pub buffer_size: String,
+
+    /// The minimum recording time. `ffmpeg` will record for at least this long.
+    pub minimum_recording_time_secs: u8,
 }
 
 /// The size of a video.
diff --git a/fxrecorder/src/lib/lib.rs b/fxrecorder/src/lib/lib.rs
index 35c2594..830d026 100644
--- a/fxrecorder/src/lib/lib.rs
+++ b/fxrecorder/src/lib/lib.rs
@@ -4,4 +4,5 @@
 
 pub mod config;
 pub mod proto;
+pub mod recorder;
 pub mod retry;
diff --git a/fxrecorder/src/lib/proto.rs b/fxrecorder/src/lib/proto.rs
index da8a312..4e07a5b 100644
--- a/fxrecorder/src/lib/proto.rs
+++ b/fxrecorder/src/lib/proto.rs
@@ -2,29 +2,39 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
+use std::error::Error;
+use std::fmt::Debug;
 use std::io;
 use std::path::Path;
 
 use libfxrecord::error::ErrorMessage;
 use libfxrecord::net::*;
 use libfxrecord::prefs::PrefValue;
-use slog::{error, info, Logger};
+use slog::{error, info, warn, Logger};
+use tempfile::TempDir;
 use thiserror::Error;
 use tokio::fs::File;
 use tokio::net::TcpStream;
 
+use crate::recorder::Recorder;
+
 /// The recorder side of the protocol.
-pub struct RecorderProto {
+pub struct RecorderProto<R> {
     inner: Option<Proto<RunnerMessage, RecorderMessage, RunnerMessageKind, RecorderMessageKind>>,
     log: Logger,
+    recorder: R,
 }
 
-impl RecorderProto {
+impl<R> RecorderProto<R>
+where
+    R: Recorder,
+{
     /// Create a new RecorderProto.
-    pub fn new(log: Logger, stream: TcpStream) -> RecorderProto {
+    pub fn new(log: Logger, stream: TcpStream, recorder: R) -> Self {
         Self {
             inner: Some(Proto::new(stream)),
             log,
+            recorder,
         }
     }
 
@@ -34,7 +44,7 @@ impl RecorderProto {
         task_id: &str,
         profile_path: Option<&Path>,
         prefs: Vec<(String, PrefValue)>,
-    ) -> Result<String, RecorderProtoError> {
+    ) -> Result<String, RecorderProtoError<R::Error>> {
         info!(self.log, "Requesting new session");
 
         let profile_size = match profile_path {
@@ -120,7 +130,9 @@ impl RecorderProto {
         &mut self,
         session_id: &str,
         idle: Idle,
-    ) -> Result<(), RecorderProtoError> {
+    ) -> Result<(), RecorderProtoError<R::Error>> {
+        let tmpdir = TempDir::new().expect("could not create temporary directory");
+
         info!(self.log, "Resuming session");
         self.send::<Session>(
             ResumeSessionRequest {
@@ -152,6 +164,61 @@ impl RecorderProto {
             info!(self.log, "Runner became idle");
         }
 
+        info!(self.log, "Beginning recording...");
+        let handle = self
+            .recorder
+            .start_recording(tmpdir.path())
+            .await
+            .map_err(RecorderProtoError::Recording)?;
+
+        info!(self.log, "requesting Firefox start...");
+        self.send(StartFirefox).await?;
+        if let Err(e) = self.recv::<StartedFirefox>().await?.result {
+            error!(self.log, "recorder could not launch firefox"; "error" => %e);
+            return Err(e.into());
+        }
+        info!(self.log, "runner started Firefox.");
+
+        let recording_path = self
+            .recorder
+            .wait_for_recording_finished(handle)
+            .await
+            .map_err(RecorderProtoError::Recording)?;
+
+        info!(self.log, "requesting runner stop Firefox...");
+        self.send(StopFirefox).await?;
+
+        if let Err(errors) = self.recv::<StoppedFirefox>().await?.result {
+            if errors.len() > 1 {
+                for error in &errors {
+                    warn!(
+                        self.log,
+                        "recorder could not stop firefox (multiple errors)";
+                        "error" => %error
+                    );
+                }
+            } else {
+                assert!(!errors.is_empty());
+                warn!(
+                    self.log,
+                    "recorder could not stop Firefox";
+                    "error" => %errors[0]
+                );
+            }
+        }
+
+        info!(self.log, "runner stopped Firefox");
+
+        if let Err(e) = self.recv::<SessionFinished>().await?.result {
+            warn!(self.log, "runner did not clean up successfully"; "error" => ?e);
+        }
+
+        info!(
+            self.log,
+            "recorded firefox";
+            "path" => %recording_path.display(),
+        );
+
         Ok(())
     }
 
@@ -160,7 +227,7 @@ impl RecorderProto {
         &mut self,
         profile_path: &Path,
         profile_size: u64,
-    ) -> Result<(), RecorderProtoError> {
+    ) -> Result<(), RecorderProtoError<R::Error>> {
         let RecvProfile { result } = self.recv().await?;
 
         match result? {
@@ -177,7 +244,7 @@ impl RecorderProto {
         }
 
         let mut stream = self.inner.take().unwrap().into_inner();
-        let result = RecorderProto::send_profile_impl(&mut stream, profile_path).await;
+        let result = Self::send_profile_impl(&mut stream, profile_path).await;
         self.inner = Some(Proto::new(stream));
 
         result?;
@@ -222,7 +289,7 @@ impl RecorderProto {
     async fn send_profile_impl(
         stream: &mut TcpStream,
         profile_path: &Path,
-    ) -> Result<(), RecorderProtoError> {
+    ) -> Result<(), RecorderProtoError<R::Error>> {
         let mut f = File::open(profile_path).await?;
 
         tokio::io::copy(&mut f, stream)
@@ -230,7 +297,6 @@ impl RecorderProto {
             .map_err(Into::into)
             .map(drop)
     }
-
     /// Send the given message to the recorder.
     ///
     /// If the underlying proto is None, this will panic.
@@ -252,8 +318,14 @@ impl RecorderProto {
     }
 }
 
+/// An error in the RecordingProto.
+///
+/// For a `RecordingProto<R: Recorder>`, `RecordingError` is `<R as Recorder>::Error`.
 #[derive(Debug, Error)]
-pub enum RecorderProtoError {
+pub enum RecorderProtoError<RecordingError>
+where
+    RecordingError: Error + 'static,
+{
     #[error(transparent)]
     Proto(#[from] ProtoError<RunnerMessageKind>),
 
@@ -266,15 +338,24 @@ pub enum RecorderProtoError {
         expected: DownloadStatus,
         received: DownloadStatus,
     },
+
+    #[error(transparent)]
+    Recording(RecordingError),
 }
 
-impl From<ErrorMessage<String>> for RecorderProtoError {
+impl<RecordingError> From<ErrorMessage<String>> for RecorderProtoError<RecordingError>
+where
+    RecordingError: Error + 'static,
+{
     fn from(e: ErrorMessage<String>) -> Self {
         RecorderProtoError::Proto(ProtoError::from(e))
     }
 }
 
-impl From<io::Error> for RecorderProtoError {
+impl<RecordingError> From<io::Error> for RecorderProtoError<RecordingError>
+where
+    RecordingError: Error + 'static,
+{
     fn from(e: io::Error) -> Self {
         RecorderProtoError::Proto(ProtoError::from(e))
     }
diff --git a/fxrunner/src/bin/main.rs b/fxrunner/src/bin/main.rs
index 8e0ec6f..3770fc3 100644
--- a/fxrunner/src/bin/main.rs
+++ b/fxrunner/src/bin/main.rs
@@ -12,6 +12,7 @@ use libfxrunner::config::Config;
 use libfxrunner::osapi::{WindowsPerfProvider, WindowsShutdownProvider};
 use libfxrunner::proto::RunnerProto;
 use libfxrunner::session::DefaultSessionManager;
+use libfxrunner::splash::WindowsSplash;
 use libfxrunner::taskcluster::FirefoxCi;
 use slog::{error, info, warn, Logger};
 use structopt::StructOpt;
@@ -83,8 +84,9 @@ async fn fxrunner(log: Logger, options: Options, config: Config) -> Result<(), B
             let (stream, addr) = listener.accept().await?;
             info!(log, "Received connection"; "peer" => addr);
 
-            let result = RunnerProto::handle_request(
+            let result = RunnerProto::<_, _, _, _, WindowsSplash>::handle_request(
                 log.clone(),
+                config.display_size,
                 stream,
                 shutdown_provider(&options),
                 FirefoxCi::default(),
diff --git a/fxrunner/src/lib/config.rs b/fxrunner/src/lib/config.rs
index b929eb5..25118fa 100644
--- a/fxrunner/src/lib/config.rs
+++ b/fxrunner/src/lib/config.rs
@@ -15,4 +15,16 @@ pub struct Config {
 
     /// The directory to store session state in.
     pub session_dir: PathBuf,
+
+    /// The size of the display.
+    pub display_size: Size,
+}
+
+/// The size of a video.
+#[derive(Copy, Clone, Debug, Deserialize, Eq, PartialEq)]
+pub struct Size {
+    /// The size in the y dimension.
+    pub y: u16,
+    /// The size in the x dimension.
+    pub x: u16,
 }
diff --git a/fxrunner/src/lib/proto.rs b/fxrunner/src/lib/proto.rs
index 98f4f73..90a94be 100644
--- a/fxrunner/src/lib/proto.rs
+++ b/fxrunner/src/lib/proto.rs
@@ -3,7 +3,9 @@
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 use std::io;
+use std::marker::PhantomData;
 use std::path::{Path, PathBuf};
+use std::process::Stdio;
 
 use indoc::indoc;
 use libfxrecord::error::ErrorExt;
@@ -15,36 +17,45 @@ use thiserror::Error;
 use tokio::fs::{create_dir, rename, File, OpenOptions};
 use tokio::net::TcpStream;
 use tokio::prelude::*;
+use tokio::process::Command;
 use tokio::task::spawn_blocking;
 
+use crate::config::Size;
 use crate::fs::PathExt;
+use crate::osapi::process::{child_processes, open_process, terminate_process};
 use crate::osapi::{cpu_and_disk_idle, PerfProvider, ShutdownProvider, WaitForIdleError};
 use crate::session::{
     cleanup_session, NewSessionError, ResumeSessionError, SessionInfo, SessionManager,
 };
+use crate::splash::Splash;
 use crate::taskcluster::Taskcluster;
 use crate::zip::{unzip, ZipError};
 
 /// The runner side of the protocol.
-pub struct RunnerProto<S, T, P, R> {
+pub struct RunnerProto<S, T, P, R, Sp> {
     inner: Option<Proto<RecorderMessage, RunnerMessage, RecorderMessageKind, RunnerMessageKind>>,
     log: Logger,
+    display_size: Size,
     shutdown_handler: S,
     tc: T,
     perf_provider: P,
     session_manager: R,
+
+    _marker: PhantomData<Sp>,
 }
 
-impl<S, T, P, R> RunnerProto<S, T, P, R>
+impl<S, T, P, R, Sp> RunnerProto<S, T, P, R, Sp>
 where
     S: ShutdownProvider,
     T: Taskcluster,
     P: PerfProvider + 'static,
     R: SessionManager,
+    Sp: Splash,
 {
     /// Handle a request from the recorder.
     pub async fn handle_request(
         log: Logger,
+        display_size: Size,
         stream: TcpStream,
         shutdown_handler: S,
         tc: T,
@@ -53,11 +64,13 @@ where
     ) -> Result<bool, RunnerProtoError<S, T, P>> {
         let mut proto = Self {
             inner: Some(Proto::new(stream)),
+            display_size,
             log,
             shutdown_handler,
             tc,
             perf_provider,
             session_manager,
+            _marker: PhantomData,
         };
 
         match proto.recv::<Session>().await? {
@@ -231,6 +244,27 @@ where
             self.send(WaitForIdle { result: Ok(()) }).await?;
         }
 
+        self.recv::<StartFirefox>().await?;
+
+        let mut splash = Sp::new(self.display_size.x as u32, self.display_size.y as u32).await?;
+        let run_firefox_result = self
+            .run_firefox(&session_info.firefox_path(), &session_info.profile_path())
+            .await;
+
+        if let Err(e) = splash.destroy() {
+            error!(self.log, "Could not destroy splash"; "error" => %e);
+
+            self.send(SessionFinished {
+                result: Err(e.into_error_message()),
+            })
+            .await?;
+        }
+
+        if let Err(e) = run_firefox_result {
+            return Err(e);
+        }
+
+        self.send(SessionFinished { result: Ok(()) }).await?;
         Ok(())
     }
 
@@ -445,6 +479,95 @@ where
         Ok(zip_path)
     }
 
+    /// Run the given Firefox binary with the specified profile.
+    ///
+    /// The process will be terminated after 45 seconds.
+    async fn run_firefox(
+        &mut self,
+        firefox_bin: &Path,
+        profile: &Path,
+    ) -> Result<(), RunnerProtoError<S, T, P>> {
+        info!(self.log, "starting Firefox...");
+        let firefox_launcher = match Command::new(firefox_bin)
+            .arg("--profile")
+            .arg(profile)
+            .arg("--new-instance")
+            .arg("--wait-for-browser")
+            .stdin(Stdio::piped())
+            .stderr(Stdio::piped())
+            .stdout(Stdio::piped())
+            .spawn()
+        {
+            Ok(launcher) => launcher,
+            Err(e) => {
+                error!(self.log, "could not start Firefox"; "error" => %e);
+                self.send(StartedFirefox {
+                    result: Err(e.into_error_message()),
+                })
+                .await?;
+                return Err(RunnerProtoError::StartFirefox(e));
+            }
+        };
+
+        self.send(StartedFirefox { result: Ok(()) }).await?;
+        self.recv::<StopFirefox>().await?;
+
+        info!(self.log, "stopping Firefox...");
+        let mut errors = Vec::new();
+
+        {
+            info!(self.log, "opening firefox process...");
+            let firefox_launcher_handle =
+                open_process(firefox_launcher.id(), winapi::um::winnt::PROCESS_ALL_ACCESS)?;
+
+            let mut terminated = false;
+
+            info!(self.log, "iterating child processes...");
+            for firefox_main_handle in child_processes(
+                firefox_launcher_handle,
+                winapi::um::winnt::PROCESS_TERMINATE,
+            )? {
+                let firefox_main_handle = match firefox_main_handle {
+                    Ok(handle) => handle,
+                    Err(e) => {
+                        error!(self.log, "could not retrieve handle to Firefox main process"; "error" => %e);
+                        errors.push(e.into_error_message());
+                        break;
+                    }
+                };
+
+                info!(self.log, "child_process()"; "handle" => ?firefox_main_handle.as_ptr());
+
+                if let Err(e) = terminate_process(&firefox_main_handle, 1) {
+                    error!(self.log, "could not terminate Firefox main process"; "error" => %e);
+                    errors.push(e.into_error_message());
+                    continue;
+                }
+
+                terminated = true;
+            }
+
+            if let Err(e) = firefox_launcher.await {
+                error!(self.log, "could not wait for Firefox launcher process to exit"; "error" => %e);
+                errors.push(e.into_error_message());
+            }
+
+            if !errors.is_empty() {
+                self.send(StoppedFirefox {
+                    result: Err(errors),
+                })
+                .await?;
+            } else if !terminated {
+                error!(self.log, "did not find a main Firefox process to terminate");
+            }
+        }
+
+        info!(self.log, "terminated Firefox");
+        self.send(StoppedFirefox { result: Ok(()) }).await?;
+
+        Ok(())
+    }
+
     /// Send the given message to the runner.
     ///
     /// If the underlying proto is None, this will panic.
@@ -505,6 +628,9 @@ where
 
     #[error(transparent)]
     EnsureProfile(io::Error),
+
+    #[error("Could not start Firefox: {}", .0)]
+    StartFirefox(#[source] io::Error),
 }
 
 impl<S, T, P> From<io::Error> for RunnerProtoError<S, T, P>
diff --git a/integration-tests/src/mocks.rs b/integration-tests/src/mocks.rs
index 880d4e0..a86080a 100644
--- a/integration-tests/src/mocks.rs
+++ b/integration-tests/src/mocks.rs
@@ -10,10 +10,12 @@ use std::sync::{Arc, Mutex};
 
 use async_trait::async_trait;
 use libfxrecord::error::ErrorMessage;
+use libfxrecorder::recorder::Recorder;
 use libfxrunner::osapi::{IoCounters, PerfProvider, ShutdownProvider};
 use libfxrunner::session::{
     NewSessionError, ResumeSessionError, ResumeSessionErrorKind, SessionInfo, SessionManager,
 };
+use libfxrunner::splash::Splash;
 use libfxrunner::taskcluster::Taskcluster;
 use tempfile::TempDir;
 use tokio::fs;
@@ -333,3 +335,36 @@ fn clone_new_session_err(err: &NewSessionError) -> NewSessionError {
         }
     }
 }
+
+pub struct TestSplash;
+
+#[async_trait]
+impl Splash for TestSplash {
+    async fn new(_display_width: u32, _display_height: u32) -> Result<Self, io::Error> {
+        Ok(TestSplash)
+    }
+
+    fn destroy(&mut self) -> Result<(), io::Error> {
+        Ok(())
+    }
+}
+
+pub struct TestRecorder;
+pub struct TestRecorderHandle(PathBuf);
+
+#[async_trait]
+impl Recorder for TestRecorder {
+    type Error = io::Error;
+    type Handle = TestRecorderHandle;
+
+    async fn start_recording(&self, directory: &Path) -> Result<Self::Handle, Self::Error> {
+        Ok(TestRecorderHandle(directory.join("recording.mp4")))
+    }
+
+    async fn wait_for_recording_finished(
+        &self,
+        handle: Self::Handle,
+    ) -> Result<PathBuf, Self::Error> {
+        Ok(handle.0)
+    }
+}
diff --git a/integration-tests/src/test.rs b/integration-tests/src/test.rs
index e982f0b..f64dc2d 100644
--- a/integration-tests/src/test.rs
+++ b/integration-tests/src/test.rs
@@ -14,6 +14,7 @@ use futures::join;
 use indoc::indoc;
 use libfxrecord::net::*;
 use libfxrecorder::proto::{RecorderProto, RecorderProtoError};
+use libfxrunner::config::Size;
 use libfxrunner::osapi::WaitForIdleError;
 use libfxrunner::proto::{RunnerProto, RunnerProtoError};
 use libfxrunner::session::{
@@ -34,11 +35,20 @@ fn test_logger() -> Logger {
     Logger::root(slog::Discard, slog::o! {})
 }
 
-type TestRunnerProto =
-    RunnerProto<TestShutdownProvider, TestTaskcluster, TestPerfProvider, TestSessionManager>;
+type TestRunnerProto = RunnerProto<
+    TestShutdownProvider,
+    TestTaskcluster,
+    TestPerfProvider,
+    TestSessionManager,
+    TestSplash,
+>;
 type TestRunnerProtoError =
     RunnerProtoError<TestShutdownProvider, TestTaskcluster, TestPerfProvider>;
 
+type TestRecorderProto = RecorderProto<TestRecorder>;
+
+const DISPLAY_SIZE: Size = Size { x: 640, y: 480 };
+
 struct RunnerInfo {
     result: Result<bool, TestRunnerProtoError>,
     session_info: Option<SessionInfo<'static>>,
@@ -51,7 +61,7 @@ async fn run_proto_test<'a, Fut>(
     tc: TestTaskcluster,
     perf_provider: TestPerfProvider,
     session_manager: TestSessionManager,
-    recorder_fn: impl FnOnce(RecorderProto) -> Fut,
+    recorder_fn: impl FnOnce(TestRecorderProto) -> Fut,
     runner_fn: impl FnOnce(RunnerInfo),
 ) where
     Fut: Future<Output = ()>,
@@ -65,6 +75,7 @@ async fn run_proto_test<'a, Fut>(
 
         let result = TestRunnerProto::handle_request(
             test_logger(),
+            DISPLAY_SIZE,
             stream,
             shutdown_provider,
             tc,
@@ -81,7 +92,7 @@ async fn run_proto_test<'a, Fut>(
 
     let recorder = async {
         let stream = TcpStream::connect(&addr).await.unwrap();
-        let proto = RecorderProto::new(test_logger(), stream);
+        let proto = TestRecorderProto::new(test_logger(), stream, TestRecorder);
 
         recorder_fn(proto).await;
     };
diff --git a/libfxrecord/src/net/message.rs b/libfxrecord/src/net/message.rs
index 569c4f3..61d2d44 100644
--- a/libfxrecord/src/net/message.rs
+++ b/libfxrecord/src/net/message.rs
@@ -142,6 +142,16 @@ message_type! {
         /// request](enum.RecorderSession.html#variant.NewSession).
         ResumeSession(ResumeSessionRequest),
     }
+
+    /// Request the runner start Firefox.
+    ///
+    /// Sent once the recorder has started ffmpeg.
+    pub struct StartFirefox;
+
+    /// Request the runner to stop Firefox.
+    ///
+    /// Send once the recorder has finished recording.
+    pub struct StopFirefox;
 }
 
 message_type! {
@@ -197,4 +207,19 @@ message_type! {
     pub struct WaitForIdle {
         pub result: ForeignResult<()>,
     }
+
+    /// The status of the StartFirefox phase.
+    pub struct StartedFirefox {
+        pub result: ForeignResult<()>,
+    }
+
+    /// The status of the StopFirefox phase.
+    pub struct StoppedFirefox {
+        pub result: Result<(), Vec<ErrorMessage<String>>>,
+    }
+
+    /// The status of any cleanup or teardown before the session finishes.
+    pub struct SessionFinished {
+        pub result: ForeignResult<()>,
+    }
 }