diff --git a/Aquality.Selenium/src/Aquality.Selenium/Aquality.Selenium.csproj b/Aquality.Selenium/src/Aquality.Selenium/Aquality.Selenium.csproj
index 7896e84d..82d6cad0 100644
--- a/Aquality.Selenium/src/Aquality.Selenium/Aquality.Selenium.csproj
+++ b/Aquality.Selenium/src/Aquality.Selenium/Aquality.Selenium.csproj
@@ -59,7 +59,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Aquality.Selenium.Core" Version="0.2.2" />
+    <PackageReference Include="Aquality.Selenium.Core" Version="0.2.5" />
     <PackageReference Include="NLog" Version="4.6.6" />
     <PackageReference Include="Selenium.Support" Version="3.141.0" />
     <PackageReference Include="Selenium.WebDriver" Version="3.141.0" />
diff --git a/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserManager.cs b/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserManager.cs
index a7b6a4fb..fa554f85 100644
--- a/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserManager.cs
+++ b/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserManager.cs
@@ -1,16 +1,8 @@
-using Aquality.Selenium.Elements;
-using Aquality.Selenium.Elements.Interfaces;
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Threading;
-using Aquality.Selenium.Core.Localization;
-using Aquality.Selenium.Core.Logging;
-using System.Reflection;
 using Aquality.Selenium.Core.Applications;
 using Aquality.Selenium.Configurations;
-using CoreElementFactory = Aquality.Selenium.Core.Elements.Interfaces.IElementFactory;
-using CoreTimeoutConfiguration = Aquality.Selenium.Core.Configurations.ITimeoutConfiguration;
-using ILoggerConfiguration = Aquality.Selenium.Core.Configurations.ILoggerConfiguration;
 
 namespace Aquality.Selenium.Browsers
 {
@@ -19,6 +11,7 @@ namespace Aquality.Selenium.Browsers
     /// </summary>
     public class BrowserManager : ApplicationManager<Browser>
     {
+        private static readonly ThreadLocal<BrowserStartup> BrowserStartupContainer = new ThreadLocal<BrowserStartup>(() => new BrowserStartup());
         private static readonly ThreadLocal<IBrowserFactory> BrowserFactoryContainer = new ThreadLocal<IBrowserFactory>();
 
         /// <summary>
@@ -27,27 +20,28 @@ public class BrowserManager : ApplicationManager<Browser>
         /// <value>Instance of desired browser.</value>
         public static Browser Browser
         {
-            get
-            {
-                return GetApplication(StartBrowserFunction, () => RegisterServices(services => Browser));
-            }
-            set
-            {
-                SetApplication(value);
-            }
+            get => GetApplication(StartBrowserFunction, ConfigureServices);
+            set => SetApplication(value);
         }
 
         private static Func<IServiceProvider, Browser> StartBrowserFunction => services => BrowserFactory.Browser;
 
         public static IServiceProvider ServiceProvider
         {
-            get
-            {
-                return GetServiceProvider(services => Browser, () => RegisterServices(services => Browser));
-            }
-            set
+            get => GetServiceProvider(services => Browser, ConfigureServices);
+            set => SetServiceProvider(value);
+        }
+
+        /// <summary>
+        /// Method which allow user to override or add custom services.
+        /// </summary>
+        /// <param name="startup"><see cref="BrowserStartup"/>> object with custom or overriden services.</param>
+        public static void SetStartup(BrowserStartup startup)
+        {
+            if (startup != null)
             {
-                SetServiceProvider(value);
+                BrowserStartupContainer.Value = startup;
+                SetServiceProvider(ConfigureServices().BuildServiceProvider());
             }
         }
 
@@ -62,30 +56,12 @@ public static IBrowserFactory BrowserFactory
                 {
                     SetDefaultFactory();
                 }
+
                 return BrowserFactoryContainer.Value;
             }
-            set
-            {
-                BrowserFactoryContainer.Value = value;
-            }
+            set => BrowserFactoryContainer.Value = value;
         }
 
-        private static IServiceCollection RegisterServices(Func<IServiceProvider, Browser> browserSupplier)
-        {
-            var services = new ServiceCollection();
-            var startup = new Startup();
-            var settingsFile = startup.GetSettings();
-            startup.ConfigureServices(services, browserSupplier, settingsFile);
-            services.AddTransient<IElementFactory, ElementFactory>();
-            services.AddTransient<CoreElementFactory, ElementFactory>();
-            services.AddSingleton<ITimeoutConfiguration>(serviceProvider => new TimeoutConfiguration(settingsFile));
-            services.AddSingleton<CoreTimeoutConfiguration>(serviceProvider => new TimeoutConfiguration(settingsFile));
-            services.AddSingleton<IBrowserProfile>(serviceProvider => new BrowserProfile(settingsFile));
-            services.AddSingleton(serviceProvider => new LocalizationManager(serviceProvider.GetRequiredService<ILoggerConfiguration>(), serviceProvider.GetRequiredService<Logger>(), Assembly.GetExecutingAssembly()));
-            services.AddTransient(serviceProvider => BrowserFactory);
-            return services;
-        }
-        
         /// <summary>
         /// Sets default factory responsible for browser creation.
         /// RemoteBrowserFactory if value set in configuration and LocalBrowserFactory otherwise.
@@ -109,12 +85,17 @@ public static void SetDefaultFactory()
         /// <summary>
         /// Resolves required service from <see cref="ServiceProvider"/>
         /// </summary>
-        /// <typeparam name="T">type of required service</typeparam>
+        /// <typeparam name="T">type of required service.</typeparam>
         /// <exception cref="InvalidOperationException">Thrown if there is no service of the required type.</exception> 
         /// <returns></returns>
         public static T GetRequiredService<T>()
         {
             return ServiceProvider.GetRequiredService<T>();
         }
+
+        private static IServiceCollection ConfigureServices()
+        {
+            return BrowserStartupContainer.Value.ConfigureServices(new ServiceCollection(), services => Browser);
+        }
     }
 }
diff --git a/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserStartup.cs b/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserStartup.cs
new file mode 100644
index 00000000..81565aae
--- /dev/null
+++ b/Aquality.Selenium/src/Aquality.Selenium/Browsers/BrowserStartup.cs
@@ -0,0 +1,36 @@
+using Aquality.Selenium.Elements;
+using Aquality.Selenium.Elements.Interfaces;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using Aquality.Selenium.Core.Localization;
+using Aquality.Selenium.Core.Logging;
+using System.Reflection;
+using Aquality.Selenium.Core.Applications;
+using Aquality.Selenium.Configurations;
+using Aquality.Selenium.Core.Configurations;
+using CoreElementFactory = Aquality.Selenium.Core.Elements.Interfaces.IElementFactory;
+using CoreTimeoutConfiguration = Aquality.Selenium.Core.Configurations.ITimeoutConfiguration;
+using ILoggerConfiguration = Aquality.Selenium.Core.Configurations.ILoggerConfiguration;
+using ITimeoutConfiguration = Aquality.Selenium.Configurations.ITimeoutConfiguration;
+using TimeoutConfiguration = Aquality.Selenium.Configurations.TimeoutConfiguration;
+
+namespace Aquality.Selenium.Browsers
+{
+    public class BrowserStartup : Startup
+    {
+        public override IServiceCollection ConfigureServices(IServiceCollection services, Func<IServiceProvider, IApplication> applicationProvider,
+            ISettingsFile settings = null)
+        {
+            settings = settings ?? GetSettings();
+            base.ConfigureServices(services, applicationProvider, settings);
+            services.AddTransient<IElementFactory, ElementFactory>();
+            services.AddTransient<CoreElementFactory, ElementFactory>();
+            services.AddSingleton<ITimeoutConfiguration>(serviceProvider => new TimeoutConfiguration(settings));
+            services.AddSingleton<CoreTimeoutConfiguration>(serviceProvider => new TimeoutConfiguration(settings));
+            services.AddSingleton<IBrowserProfile>(serviceProvider => new BrowserProfile(settings));
+            services.AddSingleton(serviceProvider => new LocalizationManager(serviceProvider.GetRequiredService<ILoggerConfiguration>(), serviceProvider.GetRequiredService<Logger>(), Assembly.GetExecutingAssembly()));
+            services.AddTransient(serviceProvider => BrowserManager.BrowserFactory);
+            return services;
+        }
+    }
+}
diff --git a/Aquality.Selenium/tests/Aquality.Selenium.Tests/Integration/UITest.cs b/Aquality.Selenium/tests/Aquality.Selenium.Tests/Integration/UITest.cs
index db4d7800..d4d5788a 100644
--- a/Aquality.Selenium/tests/Aquality.Selenium.Tests/Integration/UITest.cs
+++ b/Aquality.Selenium/tests/Aquality.Selenium.Tests/Integration/UITest.cs
@@ -7,7 +7,7 @@ namespace Aquality.Selenium.Tests.Integration
     [TestFixture]
     [Parallelizable(ParallelScope.All)]
     internal class UITest
-    {       
+    {
         [TearDown]
         public void CleanUp()
         {
diff --git a/Aquality.Selenium/tests/Aquality.Selenium.Tests/Unit/Configuration/CustomConfigurationTests.cs b/Aquality.Selenium/tests/Aquality.Selenium.Tests/Unit/Configuration/CustomConfigurationTests.cs
new file mode 100644
index 00000000..6272f361
--- /dev/null
+++ b/Aquality.Selenium/tests/Aquality.Selenium.Tests/Unit/Configuration/CustomConfigurationTests.cs
@@ -0,0 +1,75 @@
+using System;
+using Aquality.Selenium.Browsers;
+using Aquality.Selenium.Core.Applications;
+using Aquality.Selenium.Core.Configurations;
+using Microsoft.Extensions.DependencyInjection;
+using NUnit.Framework;
+
+namespace Aquality.Selenium.Tests.Unit.Configuration
+{
+    [TestFixture]
+    [Parallelizable(ParallelScope.All)]
+    internal class CustomConfigurationTests
+    {
+        private const string SpecialLoggerLanguage = "SpecialLoggerLanguage";
+        private const string SpecialCustomValue = "SpecialCustomValue";
+        private static readonly TimeSpan DefaultCommandTimeout = TimeSpan.FromSeconds(60);
+
+        [SetUp]
+        public static void Before()
+        {
+            BrowserManager.SetStartup(new CustomStartup());
+        }
+
+        [Test]
+        public void Should_BeAbleOverrideDependencies_AndGetCustomService()
+        {
+            Assert.AreEqual(SpecialLoggerLanguage, BrowserManager.GetRequiredService<ILoggerConfiguration>().Language, "Configuration value should be overriden.");
+        }
+
+        [Test]
+        public void Should_BeAbleAdd_CustomService()
+        {
+            Assert.AreEqual(SpecialCustomValue, BrowserManager.GetRequiredService<ICustomService>().CustomValue, "Custom service should have value");
+        }
+
+        [Test]
+        public void Should_BeAbleGet_DefaultService()
+        {
+            Assert.AreEqual(DefaultCommandTimeout, BrowserManager.GetRequiredService<ITimeoutConfiguration>().Command, "Default service value should have default value");
+        }
+
+        [TearDown]
+        public static void After()
+        {
+            BrowserManager.SetStartup(new BrowserStartup());
+        }
+
+        private class CustomLoggerConfiguration : ILoggerConfiguration
+        {
+            public string Language { get; } = SpecialLoggerLanguage;
+        }
+
+        private interface ICustomService
+        {
+            string CustomValue { get; }
+        }
+
+        private class CustomService : ICustomService
+        {
+            public string CustomValue { get; } = SpecialCustomValue;
+        }
+
+        private class CustomStartup : BrowserStartup
+        {
+            public override IServiceCollection ConfigureServices(IServiceCollection services, Func<IServiceProvider, IApplication> applicationProvider, ISettingsFile settings = null)
+            {
+                settings = GetSettings();
+                base.ConfigureServices(services, applicationProvider, settings);
+                services.AddSingleton<ILoggerConfiguration>(new CustomLoggerConfiguration());
+                services.AddTransient<ICustomService, CustomService>();
+                return services;
+            }
+        }
+    }
+}