diff --git a/appveyor/test_task.bat b/appveyor/test_task.bat
index e19a6f6acaa..c092083651f 100644
--- a/appveyor/test_task.bat
+++ b/appveyor/test_task.bat
@@ -46,6 +46,20 @@ set ODBC_TEST_PASS=Password12!
 set ODBC_TEST_DSN=Driver={ODBC Driver 13 for SQL Server};Server=(local)\SQL2017;Database=master;uid=%ODBC_TEST_USER%;pwd=%ODBC_TEST_PASS%
 set PDOTEST_DSN=odbc:%ODBC_TEST_DSN%
 
+rem setup Firebird related exts
+curl -sLo Firebird.zip https://github.com/FirebirdSQL/firebird/releases/download/v3.0.9/Firebird-3.0.9.33560-0_x64.zip
+7z x -oC:\Firebird Firebird.zip
+set PDO_FIREBIRD_TEST_DATABASE=C:\test.fdb
+set PDO_FIREBIRD_TEST_DSN=firebird:dbname=%PDO_FIREBIRD_TEST_DATABASE%
+set PDO_FIREBIRD_TEST_USER=SYSDBA
+set PDO_FIREBIRD_TEST_PASS=phpfi
+echo create database '%PDO_FIREBIRD_TEST_DATABASE%' user '%PDO_FIREBIRD_TEST_USER%' password '%PDO_FIREBIRD_TEST_PASS%';> C:\Firebird\setup.sql
+C:\Firebird\instsvc.exe install -n TestInstance
+C:\Firebird\isql -q -i C:\Firebird\setup.sql
+C:\Firebird\instsvc.exe start -n TestInstance
+if %errorlevel% neq 0 exit /b 3
+path C:\Firebird;%PATH%
+
 rem prepare for ext/openssl
 if "%APPVEYOR%" equ "True" rmdir /s /q C:\OpenSSL-Win32 >NUL 2>NUL
 if "%APPVEYOR%" equ "True" rmdir /s /q C:\OpenSSL-Win64 >NUL 2>NUL
@@ -111,7 +125,7 @@ rem work-around for some spawned PHP processes requiring OpenSSL
 echo extension=php_openssl.dll >> %PHP_BUILD_DIR%\php.ini
 
 rem remove ext dlls for which tests are not supported
-for %%i in (ldap oci8_12c pdo_firebird pdo_oci) do (
+for %%i in (ldap oci8_12c pdo_oci) do (
 	del %PHP_BUILD_DIR%\php_%%i.dll
 )
 
diff --git a/ext/pdo/tests/bug_73234.phpt b/ext/pdo/tests/bug_73234.phpt
index 01dcf401618..8f7c28df557 100644
--- a/ext/pdo/tests/bug_73234.phpt
+++ b/ext/pdo/tests/bug_73234.phpt
@@ -6,6 +6,7 @@ pdo
 <?php
 $dir = getenv('REDIR_TEST_DIR');
 if (false == $dir) die('skip no driver');
+if (str_starts_with(getenv('PDOTEST_DSN'), "firebird")) die('xfail firebird driver does not behave as expected');
 require_once $dir . 'pdo_test.inc';
 PDOTest::skip();
 ?>
diff --git a/ext/pdo/tests/gh8626.phpt b/ext/pdo/tests/gh8626.phpt
index a77b06a22e1..30ecbf6d3ab 100644
--- a/ext/pdo/tests/gh8626.phpt
+++ b/ext/pdo/tests/gh8626.phpt
@@ -41,7 +41,7 @@ array(3) {
   [0]=>
   string(%d) "%s"
   [1]=>
-  int(%d)
+  int(%i)
   [2]=>
   string(%d) "%s%w%S"
 }
diff --git a/ext/pdo/tests/pdo_039.phpt b/ext/pdo/tests/pdo_039.phpt
index ecde2428769..04a87a372e7 100644
--- a/ext/pdo/tests/pdo_039.phpt
+++ b/ext/pdo/tests/pdo_039.phpt
@@ -6,6 +6,7 @@ pdo
 <?php
 $dir = getenv('REDIR_TEST_DIR');
 if (false == $dir) die('skip no driver');
+if (str_starts_with(getenv('PDOTEST_DSN'), "firebird")) die('xfail firebird driver does not behave as expected');
 require_once $dir . 'pdo_test.inc';
 PDOTest::skip();
 ?>