diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d248db8f..3180de97 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -104,45 +104,45 @@ node test_xeus_cpp.js
 It is possible to run the Emscripten tests in a headless browser. We will run our tests in a fresh installed browser. Installing the browsers, and running the tests within the installed browsers will be platform dependent. To do this on MacOS execute the following
 
 ```bash
-    wget "https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US" -O Firefox-latest.dmg
-    hdiutil attach Firefox-latest.dmg
-    cp -r /Volumes/Firefox/Firefox.app $PWD
-    hdiutil detach /Volumes/Firefox
-    cd ./Firefox.app/Contents/MacOS/
-    export PATH="$PWD:$PATH"
-    cd –
-
-    wget https://dl.google.com/chrome/mac/stable/accept_tos%3Dhttps%253A%252F%252Fwww.google.com%252Fintl%252Fen_ph%252Fchrome%252Fterms%252F%26_and_accept_tos%3Dhttps%253A%252F%252Fpolicies.google.com%252Fterms/googlechrome.pkg
-    pkgutil --expand-full googlechrome.pkg google-chrome
-    cd ./google-chrome/GoogleChrome.pkg/Payload/Google\ Chrome.app/Contents/MacOS/
-    export PATH="$PWD:$PATH"
-    cd –
-
-    echo "Running test_xeus_cpp in Firefox"
-    python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --browser-args="--headless"  test_xeus_cpp.html
-    echo "Running test_xeus_cpp in Google Chrome"
-    python $BUILD_PREFIX/bin/emrun.py --browser="Google Chrome" --kill_exit --browser-args="--headless  --no-sandbox"  test_xeus_cpp.html
+wget "https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US" -O Firefox-latest.dmg
+hdiutil attach Firefox-latest.dmg
+cp -r /Volumes/Firefox/Firefox.app $PWD
+hdiutil detach /Volumes/Firefox
+cd ./Firefox.app/Contents/MacOS/
+export PATH="$PWD:$PATH"
+cd –
+
+wget https://dl.google.com/chrome/mac/stable/accept_tos%3Dhttps%253A%252F%252Fwww.google.com%252Fintl%252Fen_ph%252Fchrome%252Fterms%252F%26_and_accept_tos%3Dhttps%253A%252F%252Fpolicies.google.com%252Fterms/googlechrome.pkg
+pkgutil --expand-full googlechrome.pkg google-chrome
+cd ./google-chrome/GoogleChrome.pkg/Payload/Google\ Chrome.app/Contents/MacOS/
+export PATH="$PWD:$PATH"
+cd –
+
+echo "Running test_xeus_cpp in Firefox"
+python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --browser-args="--headless"  test_xeus_cpp.html
+echo "Running test_xeus_cpp in Google Chrome"
+python $BUILD_PREFIX/bin/emrun.py --browser="Google Chrome" --kill_exit --browser-args="--headless  --no-sandbox"  test_xeus_cpp.html
 ```
 
 To do this on Ubuntu x86 execute the following
 
 ```bash
-    wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
-    dpkg-deb -x google-chrome-stable_current_amd64.deb $PWD/chrome
-    cd ./chrome/opt/google/chrome/
-    export PATH="$PWD:$PATH"
-    cd -
-
-    wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
-    tar -xJf firefox-138.0.1.tar.xz
-    cd ./firefox
-    export PATH="$PWD:$PATH"
-    cd -
-
-    echo "Running test_xeus_cpp in Firefox"
-    python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
-    echo "Running test_xeus_cpp in Google Chrome"
-    python $BUILD_PREFIX/bin/emrun.py --browser="google-chrome" --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  test_xeus_cpp.html
+wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
+dpkg-deb -x google-chrome-stable_current_amd64.deb $PWD/chrome
+cd ./chrome/opt/google/chrome/
+export PATH="$PWD:$PATH"
+cd -
+
+wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
+tar -xJf firefox-138.0.1.tar.xz
+cd ./firefox
+export PATH="$PWD:$PATH"
+cd -
+
+echo "Running test_xeus_cpp in Firefox"
+python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
+echo "Running test_xeus_cpp in Google Chrome"
+python $BUILD_PREFIX/bin/emrun.py --browser="google-chrome" --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  test_xeus_cpp.html
 ```
 
 To build Jupyter Lite with this kernel without creating a website you can execute the following
diff --git a/README.md b/README.md
index 9c1bbd2b..d2ec051c 100644
--- a/README.md
+++ b/README.md
@@ -106,45 +106,45 @@ node test_xeus_cpp.js
 It is possible to run the Emscripten tests in a headless browser. We will run our tests in a fresh installed browser. Installing the browsers, and running the tests within the installed browsers will be platform dependent. To do this on MacOS execute the following
 
 ```bash
-    wget "https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US" -O Firefox-latest.dmg
-    hdiutil attach Firefox-latest.dmg
-    cp -r /Volumes/Firefox/Firefox.app $PWD
-    hdiutil detach /Volumes/Firefox
-    cd ./Firefox.app/Contents/MacOS/
-    export PATH="$PWD:$PATH"
-    cd -
-
-    wget https://dl.google.com/chrome/mac/stable/accept_tos%3Dhttps%253A%252F%252Fwww.google.com%252Fintl%252Fen_ph%252Fchrome%252Fterms%252F%26_and_accept_tos%3Dhttps%253A%252F%252Fpolicies.google.com%252Fterms/googlechrome.pkg
-    pkgutil --expand-full googlechrome.pkg google-chrome
-    cd ./google-chrome/GoogleChrome.pkg/Payload/Google\ Chrome.app/Contents/MacOS/
-    export PATH="$PWD:$PATH"
-    cd -
-
-    echo "Running test_xeus_cpp in Firefox"
-    python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
-    echo "Running test_xeus_cpp in Google Chrome"
-    python python $BUILD_PREFIX/bin/emrun.py --browser="Google Chrome" --kill_exit --timeout 60 --browser-args="--headless  --no-sandbox"  test_xeus_cpp.html
+wget "https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US" -O Firefox-latest.dmg
+hdiutil attach Firefox-latest.dmg
+cp -r /Volumes/Firefox/Firefox.app $PWD
+hdiutil detach /Volumes/Firefox
+cd ./Firefox.app/Contents/MacOS/
+export PATH="$PWD:$PATH"
+cd -
+
+wget https://dl.google.com/chrome/mac/stable/accept_tos%3Dhttps%253A%252F%252Fwww.google.com%252Fintl%252Fen_ph%252Fchrome%252Fterms%252F%26_and_accept_tos%3Dhttps%253A%252F%252Fpolicies.google.com%252Fterms/googlechrome.pkg
+pkgutil --expand-full googlechrome.pkg google-chrome
+cd ./google-chrome/GoogleChrome.pkg/Payload/Google\ Chrome.app/Contents/MacOS/
+export PATH="$PWD:$PATH"
+cd -
+
+echo "Running test_xeus_cpp in Firefox"
+python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
+echo "Running test_xeus_cpp in Google Chrome"
+python python $BUILD_PREFIX/bin/emrun.py --browser="Google Chrome" --kill_exit --timeout 60 --browser-args="--headless  --no-sandbox"  test_xeus_cpp.html
 ```
 
 To do this on Ubuntu x86 execute the following
 
 ```bash
-    wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
-    dpkg-deb -x google-chrome-stable_current_amd64.deb $PWD/chrome
-    cd ./chrome/opt/google/chrome/
-    export PATH="$PWD:$PATH"
-    cd -
-
-    wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
-    tar -xJf firefox-138.0.1.tar.xz
-    cd ./firefox
-    export PATH="$PWD:$PATH"
-    cd -
-
-    echo "Running test_xeus_cpp in Firefox"
-    python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
-    echo "Running test_xeus_cpp in Google Chrome"
-    python $BUILD_PREFIX/bin/emrun.py --browser="google-chrome" --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  test_xeus_cpp.html
+wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
+dpkg-deb -x google-chrome-stable_current_amd64.deb $PWD/chrome
+cd ./chrome/opt/google/chrome/
+export PATH="$PWD:$PATH"
+cd -
+
+wget https://ftp.mozilla.org/pub/firefox/releases/138.0.1/linux-x86_64/en-GB/firefox-138.0.1.tar.xz
+tar -xJf firefox-138.0.1.tar.xz
+cd ./firefox
+export PATH="$PWD:$PATH"
+cd -
+
+echo "Running test_xeus_cpp in Firefox"
+python $BUILD_PREFIX/bin/emrun.py --browser="firefox" --kill_exit --timeout 60 --browser-args="--headless"  test_xeus_cpp.html
+echo "Running test_xeus_cpp in Google Chrome"
+python $BUILD_PREFIX/bin/emrun.py --browser="google-chrome" --kill_exit --timeout 60 --browser-args="--headless --no-sandbox"  test_xeus_cpp.html
 ```
 
 To build Jupyter Lite with this kernel without creating a website you can execute the following