diff --git a/pkgs/by-name/mu/mullvad-browser/package.nix b/pkgs/by-name/mu/mullvad-browser/package.nix
index 4e9fb3c5c866b..4a71136aa3d45 100644
--- a/pkgs/by-name/mu/mullvad-browser/package.nix
+++ b/pkgs/by-name/mu/mullvad-browser/package.nix
@@ -7,6 +7,7 @@
 , writeText
 , wrapGAppsHook3
 , autoPatchelfHook
+, patchelfUnstable # have to use patchelfUnstable to support --no-clobber-old-sections
 , callPackage
 
 , atk
@@ -125,7 +126,13 @@ stdenv.mkDerivation rec {
 
   src = sources.${stdenv.hostPlatform.system} or (throw "unsupported system: ${stdenv.hostPlatform.system}");
 
-  nativeBuildInputs = [ copyDesktopItems makeWrapper wrapGAppsHook3 autoPatchelfHook ];
+  nativeBuildInputs = [
+    autoPatchelfHook
+    patchelfUnstable
+    copyDesktopItems
+    makeWrapper
+    wrapGAppsHook3
+  ];
   buildInputs = [
     gtk3
     alsa-lib
@@ -133,6 +140,9 @@ stdenv.mkDerivation rec {
     libXtst
   ];
 
+  # Firefox uses "relrhack" to manually process relocations from a fixed offset
+  patchelfFlags = [ "--no-clobber-old-sections" ];
+
   preferLocalBuild = true;
   allowSubstitutes = false;
 
@@ -165,7 +175,8 @@ stdenv.mkDerivation rec {
     tar xf "$src" -C "$MB_IN_STORE" --strip-components=2
     pushd "$MB_IN_STORE"
 
-    patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" "mullvadbrowser.real"
+    # Set ELF interpreter
+    autoPatchelf mullvadbrowser.real
 
     # mullvadbrowser is a wrapper that checks for a more recent libstdc++ & appends it to the ld path
     mv mullvadbrowser.real mullvadbrowser
diff --git a/pkgs/by-name/to/tor-browser/package.nix b/pkgs/by-name/to/tor-browser/package.nix
index 32b04dba1f348..ced550e211703 100644
--- a/pkgs/by-name/to/tor-browser/package.nix
+++ b/pkgs/by-name/to/tor-browser/package.nix
@@ -6,6 +6,7 @@
 , makeWrapper
 , writeText
 , autoPatchelfHook
+, patchelfUnstable # have to use patchelfUnstable to support --no-clobber-old-sections
 , wrapGAppsHook3
 , callPackage
 
@@ -144,7 +145,13 @@ stdenv.mkDerivation rec {
 
   src = sources.${stdenv.hostPlatform.system} or (throw "unsupported system: ${stdenv.hostPlatform.system}");
 
-  nativeBuildInputs = [ autoPatchelfHook copyDesktopItems makeWrapper wrapGAppsHook3 ];
+  nativeBuildInputs = [
+    autoPatchelfHook
+    patchelfUnstable
+    copyDesktopItems
+    makeWrapper
+    wrapGAppsHook3
+  ];
   buildInputs = [
     gtk3
     alsa-lib
@@ -152,6 +159,9 @@ stdenv.mkDerivation rec {
     libXtst
   ];
 
+  # Firefox uses "relrhack" to manually process relocations from a fixed offset
+  patchelfFlags = [ "--no-clobber-old-sections" ];
+
   preferLocalBuild = true;
   allowSubstitutes = false;
 
@@ -178,7 +188,6 @@ stdenv.mkDerivation rec {
 
     # For convenience ...
     TBB_IN_STORE=$out/share/tor-browser
-    interp=$(< $NIX_CC/nix-support/dynamic-linker)
 
     # Unpack & enter
     mkdir -p "$TBB_IN_STORE"
@@ -186,10 +195,7 @@ stdenv.mkDerivation rec {
     pushd "$TBB_IN_STORE"
 
     # Set ELF interpreter
-    for exe in firefox.real TorBrowser/Tor/tor ; do
-      echo "Setting ELF interpreter on $exe ..." >&2
-      patchelf --set-interpreter "$interp" "$exe"
-    done
+    autoPatchelf firefox.real TorBrowser/Tor
 
     # firefox is a wrapper that checks for a more recent libstdc++ & appends it to the ld path
     mv firefox.real firefox
@@ -210,16 +216,6 @@ stdenv.mkDerivation rec {
     substituteInPlace TorBrowser/Data/Tor/torrc-defaults \
       --replace-fail './TorBrowser' "$TBB_IN_STORE/TorBrowser"
 
-    # Fixup obfs transport.  Work around patchelf failing to set
-    # interpreter for pre-compiled Go binaries by invoking the interpreter
-    # directly.
-    sed -i TorBrowser/Data/Tor/torrc-defaults \
-        -e "s|\(ClientTransportPlugin meek_lite,obfs2,obfs3,obfs4,scramblesuit\) exec|\1 exec $interp|"
-
-    # Similarly fixup snowflake
-    sed -i TorBrowser/Data/Tor/torrc-defaults \
-        -e "s|\(ClientTransportPlugin snowflake\) exec|\1 exec $interp|"
-
     # Prepare for autoconfig.
     #
     # See https://developer.mozilla.org/en-US/Firefox/Enterprise_deployment