diff --git a/tests/test.bats b/tests/test.bats
index 024f695..13f1b21 100644
--- a/tests/test.bats
+++ b/tests/test.bats
@@ -52,6 +52,8 @@ health_checks() {
   assert_output --partial "PHP ${FRANKENPHP_PHP_VERSION}"
   refute_output --partial "Warning"
   refute_output --partial "is already loaded"
+  refute_output --partial "cannot open shared object file"
+  refute_output --partial "in Unknown on line"
 
   run ddev php --ini
   assert_success
@@ -164,31 +166,28 @@ health_checks() {
   assert_line "zip"
 
   if [[ "${FRANKENPHP_CUSTOM_EXTENSION}" == "true" ]]; then
-    assert_output --partial "example_pie_extension"
+    assert_line "example_pie_extension"
   else
-    refute_output --partial "example_pie_extension"
+    refute_line "example_pie_extension"
   fi
 
-  run ddev xdebug on
-  assert_success
-
-  run ddev php -m
-  assert_success
-  assert_output --partial "xdebug"
-
-  run ddev xhprof on
-  assert_success
-
-  run ddev php -m
-  assert_success
-  assert_output --partial "xhprof"
+  refute_output --partial "Warning"
+  refute_output --partial "is already loaded"
+  refute_output --partial "cannot open shared object file"
+  refute_output --partial "in Unknown on line"
 
-  run ddev blackfire on
-  assert_success
+  for extension in xdebug xhprof blackfire; do
+    run ddev "${extension}" on
+    assert_success
 
-  run ddev php -m
-  assert_success
-  assert_output --partial "blackfire"
+    run ddev php -m
+    assert_success
+    assert_line "${extension}"
+    refute_output --partial "Warning"
+    refute_output --partial "is already loaded"
+    refute_output --partial "cannot open shared object file"
+    refute_output --partial "in Unknown on line"
+  done
 }
 
 teardown() {
diff --git a/web-build/Dockerfile.frankenphp b/web-build/Dockerfile.frankenphp
index 5796611..eed5faf 100644
--- a/web-build/Dockerfile.frankenphp
+++ b/web-build/Dockerfile.frankenphp
@@ -17,8 +17,26 @@ sed -i 's|/etc/php/${DDEV_PHP_VERSION}/fpm/conf.d/|/etc/php-zts/conf.d/|g' /star
 # Copy DDEV PHP module configurations to php-zts location
 cp /etc/php/${DDEV_PHP_VERSION}/mods-available/assert.ini /etc/php-zts/conf.d/20-assert.ini
 cp /etc/php/${DDEV_PHP_VERSION}/mods-available/blackfire.ini /etc/php-zts/conf.d/90-blackfire.ini
-cp /etc/php/${DDEV_PHP_VERSION}/mods-available/xdebug.ini /etc/php-zts/conf.d/15-xdebug.ini
-cp /etc/php/${DDEV_PHP_VERSION}/mods-available/xhprof.ini /etc/php-zts/conf.d/20-xhprof.ini
+
+# Append DDEV extension configurations to existing php-zts ini files
+for EXT_NAME in xdebug xhprof; do
+    # Find the source extension ini file in mods-available
+    EXT_SRC_INI=$(find "/etc/php/${DDEV_PHP_VERSION}/mods-available" -name "*${EXT_NAME}*.ini" -type f | head -n 1)
+    if [ -z "$EXT_SRC_INI" ]; then
+        echo "ERROR: ${EXT_NAME} ini file not found in /etc/php/${DDEV_PHP_VERSION}/mods-available" >&2
+        exit 1
+    fi
+
+    # Find the destination extension ini file in php-zts conf.d
+    EXT_ZTS_INI=$(find /etc/php-zts/conf.d -name "*${EXT_NAME}*.ini" -type f | head -n 1)
+    if [ -z "$EXT_ZTS_INI" ]; then
+        echo "ERROR: ${EXT_NAME} ini file not found in /etc/php-zts/conf.d" >&2
+        exit 1
+    fi
+
+    # Append config from mods-available, excluding extension loading lines
+    grep -v -E '^(zend_)?extension=' "$EXT_SRC_INI" >> "$EXT_ZTS_INI"
+done
 
 # Create symlinks for phpenmod and phpdismod to use php-zts versions
 ln -sf /usr/sbin/phpenmod-zts /usr/sbin/phpenmod
@@ -26,6 +44,8 @@ ln -sf /usr/sbin/phpdismod-zts /usr/sbin/phpdismod
 
 # Reconfigure blackfire-php if installed, to match the current PHP version
 if dpkg -s blackfire-php >/dev/null 2>&1; then
+    apt-get update || true
+    apt-get install -y --only-upgrade blackfire-php
     dpkg-reconfigure blackfire-php
 fi