diff --git a/README.md b/README.md
index 37d4e1e..a7afa78 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ Run the script `builder.sh` with the following options:
 - `-c, --clean` : Clean build.
 - `-u, --update` : Update Mozilla repository.
 - `-p, --patches` : Update patches.
+- `-r, --run` : Run the project after build using mach run in the browser directory
 - `-h, --help` : Display usage instructions.
 
 For example:
diff --git a/builder.sh b/builder.sh
index b57e30f..5f59e4f 100755
--- a/builder.sh
+++ b/builder.sh
@@ -66,6 +66,13 @@ configure_and_build() {
     ./mach build || { echo "Build failed. Exiting."; exit 1; }
 }
 
+# Function to run the project after build
+run_project() {
+    echo "Running the project..."
+    cd "$SOURCE_PATH" || { echo "Failed to navigate to browser directory. Exiting."; exit 1; }
+    ./mach run || { echo "Failed to run the project. Exiting."; exit 1; }
+}
+
 # Function to print usage instructions
 print_help() {
     echo "Usage: ./builder.sh [options]"
@@ -75,6 +82,7 @@ print_help() {
     echo "  -c, --clean     : Clean build"
     echo "  -u, --update    : Update Mozilla repository"
     echo "  -p, --patches   : Update patches"
+    echo "  -r, --run       : Run the project after build using mach run in the browser directory"
     echo "  -h, --help      : Display this help message"
     exit 1
 }
@@ -98,6 +106,9 @@ while [[ $# -gt 0 ]]; do
         -p|--patches)
             patches=true
             ;;
+        -r|--run)
+            run=true
+            ;;
         -h|--help)
             print_help
             ;;
@@ -117,9 +128,15 @@ if [ "$all" = true ]; then
     update_repo
     update_patches
     configure_and_build
+    if [ "$run" = true ]; then
+        run_project
+    fi
     echo "Spitfire build completed successfully."
-if [ "$build" = true ]; then
+elif [ "$build" = true ]; then
     configure_and_build
+    if [ "$run" = true ]; then
+        run_project
+    fi
     echo "Spitfire build completed successfully."
 elif [ "$clean" = true ]; then
     clean_build
@@ -132,6 +149,8 @@ elif [ "$patches" = true ]; then
     download_source
     update_patches
     echo "Patches updated."
+elif [ "$run" = true ]; then
+    run_project
 else
     print_help
 fi