diff --git a/extra/firefox/checksums b/extra/firefox/checksums
index 244dbeaa..69935db5 100644
--- a/extra/firefox/checksums
+++ b/extra/firefox/checksums
@@ -1,9 +1,8 @@
-109bf9851d2d233f7886d53de2fac64d6c43e41dfa52436b6893d642a94ae83870
+570073da2cbe06d3d438887fcb207ae1e46cfe7fa8153a0c2ce4ed5deac7a151ec
 3e4e722acd2ab2e38a16ec23b29296318d77cc54f034d4b21d91bde085e26bc0a3
 49e95cf848c09df618587bb8286bed3ed9531e24554b9ef275f070201078dba7f5
 0d706838ba8eccf898dbebb70c1bd71b2ef76f83c5c89b5af33831584e912e08b4
-ff77749c0abdce8930fa98be8e62c1fd567bb690af3a4e173d0428620972dc79a9
-9207f7b9aaaeaa7e55b07e8a723f34413f7436404a2c161751e92bf785dffdaa90
+7cdfeaee2a37a5ba75901cce28975882d638c4c2705839d66a875bbed3471da7be
 8c0f419eb138061e67dbe2ac73e9c8332649fb90aacb57ac4f00d5de94c0cf23a8
 b45fc52ba1ab0e20991b7f8f5841fecc42840979cee263f943c0e017fbc2345538
 1cace7c18c7d80b4abe8665d5ec2c66a0f3c1807ff3f7c8311b925f8ed635037f0
diff --git a/extra/firefox/patches/mach-python-3.13.1.patch b/extra/firefox/patches/mach-python-3.13.1.patch
deleted file mode 100644
index 55d3919d..00000000
--- a/extra/firefox/patches/mach-python-3.13.1.patch
+++ /dev/null
@@ -1,120 +0,0 @@
-diff --git a/python/mach/mach/site.py b/python/mach/mach/site.py
---- a/python/mach/mach/site.py
-+++ b/python/mach/mach/site.py
-@@ -15,10 +15,11 @@
- import site
- import subprocess
- import sys
- import sysconfig
- import tempfile
-+import warnings
- from contextlib import contextmanager
- from pathlib import Path
- from typing import Callable, Optional
- 
- from mach.requirements import (
-@@ -817,37 +818,79 @@
- 
- class PythonVirtualenv:
-     """Calculates paths of interest for general python virtual environments"""
- 
-     def __init__(self, prefix):
--        if _is_windows:
--            self.bin_path = os.path.join(prefix, "Scripts")
--            self.python_path = os.path.join(self.bin_path, "python.exe")
--        else:
--            self.bin_path = os.path.join(prefix, "bin")
--            self.python_path = os.path.join(self.bin_path, "python")
-         self.prefix = os.path.realpath(prefix)
-+        self.paths = self._get_sysconfig_paths(self.prefix)
- 
--    @functools.lru_cache(maxsize=None)
--    def resolve_sysconfig_packages_path(self, sysconfig_path):
--        # macOS uses a different default sysconfig scheme based on whether it's using the
--        # system Python or running in a virtualenv.
--        # Manually define the scheme (following the implementation in
--        # "sysconfig._get_default_scheme()") so that we're always following the
--        # code path for a virtualenv directory structure.
--        if os.name == "posix":
--            scheme = "posix_prefix"
--        else:
--            scheme = os.name
-+        # Name of the Python executable to use in virtual environments.
-+        # An executable with the same name as sys.executable might not exist in
-+        # virtual environments. An executable with 'python' as the steam —
-+        # without version numbers or ABI flags — will always be present in
-+        # virtual environments, so we use that.
-+        python_exe_name = "python" + sysconfig.get_config_var("EXE")
-+
-+        self.bin_path = self.paths["scripts"]
-+        self.python_path = os.path.join(self.bin_path, python_exe_name)
- 
--        sysconfig_paths = sysconfig.get_paths(scheme)
--        data_path = Path(sysconfig_paths["data"])
--        path = Path(sysconfig_paths[sysconfig_path])
--        relative_path = path.relative_to(data_path)
-+    @staticmethod
-+    def _get_sysconfig_paths(prefix):
-+        """Calculate the sysconfig paths of a virtual environment in the given prefix.
- 
--        # Path to virtualenv's "site-packages" directory for provided sysconfig path
--        return os.path.normpath(os.path.normcase(Path(self.prefix) / relative_path))
-+        The virtual environment MUST be using the same Python distribution as us.
-+        """
-+        # Determine the sysconfig scheme used in virtual environments
-+        if "venv" in sysconfig.get_scheme_names():
-+            # A 'venv' scheme was added in Python 3.11 to allow users to
-+            # calculate the paths for a virtual environment, since the default
-+            # scheme may not always be the same as used on virtual environments.
-+            # Some common examples are the system Python distributed by macOS,
-+            # Debian, and Fedora.
-+            # For more information, see https://github.com/python/cpython/issues/89576
-+            venv_scheme = "venv"
-+        elif os.name == "nt":
-+            # We know that before the 'venv' scheme was added, on Windows,
-+            # the 'nt' scheme was used in virtual environments.
-+            venv_scheme = "nt"
-+        elif os.name == "posix":
-+            # We know that before the 'venv' scheme was added, on POSIX,
-+            # the 'posix_prefix' scheme was used in virtual environments.
-+            venv_scheme = "posix_prefix"
-+        else:
-+            # This should never happen with upstream Python, as the 'venv'
-+            # scheme should always be available on >=3.11, and no other
-+            # platforms are supported by the upstream on older Python versions.
-+            #
-+            # Since the 'venv' scheme isn't available, and we have no knowledge
-+            # of this platform/distribution, fallback to the default scheme.
-+            #
-+            # Hitting this will likely be the result of running a custom Python
-+            # distribution targetting a platform that is not supported by the
-+            # upstream.
-+            # In this case, unless the Python vendor patched the Python
-+            # distribution in such a way as the default scheme may not always be
-+            # the same scheme, using the default scheme should be correct.
-+            # If the vendor did patch Python as such, to work around this issue,
-+            # I would recommend them to define a 'venv' scheme that matches
-+            # the layout used on virtual environments in their Python distribution.
-+            # (rec. signed Filipe Laíns — upstream sysconfig maintainer)
-+            venv_scheme = sysconfig.get_default_scheme()
-+            warnings.warn(
-+                f"Unknown platform '{os.name}', using the default install scheme '{venv_scheme}'. "
-+                "If this is incorrect, please ask your Python vendor to add a 'venv' sysconfig scheme "
-+                "(see https://github.com/python/cpython/issues/89576, or check the code comment).",
-+                stacklevel=2,
-+            )
-+        # Build the sysconfig config_vars dictionary for the virtual environment.
-+        venv_vars = sysconfig.get_config_vars().copy()
-+        venv_vars["base"] = venv_vars["platbase"] = prefix
-+        # Get sysconfig paths for the virtual environment.
-+        return sysconfig.get_paths(venv_scheme, vars=venv_vars)
-+
-+    def resolve_sysconfig_packages_path(self, sysconfig_path):
-+        return self.paths[sysconfig_path]
- 
-     def site_packages_dirs(self):
-         dirs = []
-         if sys.platform.startswith("win"):
-             dirs.append(os.path.normpath(os.path.normcase(self.prefix)))
-
-
diff --git a/extra/firefox/patches/musl-sandbox.patch b/extra/firefox/patches/musl-sandbox.patch
index 89f6d4f5..5cf2b335 100644
--- a/extra/firefox/patches/musl-sandbox.patch
+++ b/extra/firefox/patches/musl-sandbox.patch
@@ -1,25 +1,10 @@
-make SYS_fork non-fatal, musl uses it for fork(2)
-
---- a/security/sandbox/linux/SandboxFilter.cpp
-+++ b/security/sandbox/linux/SandboxFilter.cpp
-@@ -1253,6 +1253,10 @@
-         // usually do something reasonable on error.
-       case __NR_clone:
-         return ClonePolicy(Error(EPERM));
-+#ifdef __NR_fork
-+      case __NR_fork:
-+        return Error(ENOSYS);
-+#endif
- 
- #  ifdef __NR_fadvise64
-       case __NR_fadvise64:
-
-upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1657849
 diff --git a/security/sandbox/linux/SandboxFilter.cpp b/security/sandbox/linux/SandboxFilter.cpp
-index ed958bc..9824433 100644
+index 5f14e78..1b968ea 100644
 --- a/security/sandbox/linux/SandboxFilter.cpp
 +++ b/security/sandbox/linux/SandboxFilter.cpp
-@@ -1751,6 +1751,6 @@ class GMPSandboxPolicy : public SandboxPolicyCommon {
+@@ -1763,10 +1763,10 @@ class GMPSandboxPolicy : public SandboxPolicyCommon {
+         return Allow();
+       case __NR_sched_get_priority_min:
        case __NR_sched_get_priority_max:
 +      case __NR_sched_setscheduler:
          return Allow();
@@ -28,14 +13,21 @@ index ed958bc..9824433 100644
 -      case __NR_sched_setscheduler: {
 +      case __NR_sched_getscheduler: {
          Arg<pid_t> pid(0);
-@@ -1926,3 +1926,2 @@ class RDDSandboxPolicy final : public SandboxPolicyCommon {
+         return If(pid == 0, Allow()).Else(Trap(SchedTrap, nullptr));
+       }
+@@ -1956,12 +1956,14 @@ class RDDSandboxPolicy final : public SandboxPolicyCommon {
+       case __NR_sched_getparam:
+       case __NR_sched_setparam:
        case __NR_sched_getscheduler:
 -      case __NR_sched_setscheduler:
        case __NR_sched_getattr:
-@@ -1932,2 +1931,5 @@ class RDDSandboxPolicy final : public SandboxPolicyCommon {
+       case __NR_sched_setattr: {
+         Arg<pid_t> pid(0);
+         return If(pid == 0, Allow()).Else(Trap(SchedTrap, nullptr));
        }
 +      // sched_setscheduler gets special treatment here (bug 1657849):
 +      case __NR_sched_setscheduler:
 +        return Allow();
  
-
+         // The priority bounds are also used, sometimes (bug 1838675):
+       case __NR_sched_get_priority_min:
diff --git a/extra/firefox/sources b/extra/firefox/sources
index 8c0c0484..71f8497c 100644
--- a/extra/firefox/sources
+++ b/extra/firefox/sources
@@ -1,8 +1,7 @@
-https://ftp.mozilla.org/pub/firefox/releases/133.0.3/source/firefox-133.0.3.source.tar.xz
+https://ftp.mozilla.org/pub/firefox/releases/134.0/source/firefox-134.0.source.tar.xz
 patches/fix-target-detection.patch
 patches/fix-vaapi.patch
 patches/gcc-14.patch
-patches/mach-python-3.13.1.patch
 patches/musl-sandbox.patch
 patches/no-atk.patch
 patches/no-dbus.patch
diff --git a/extra/firefox/version b/extra/firefox/version
index e4344fb4..69fa480a 100644
--- a/extra/firefox/version
+++ b/extra/firefox/version
@@ -1 +1 @@
-133.0.3 1
+134.0 1