diff --git a/src/libraries/sendtohelix-wasm.targets b/src/libraries/sendtohelix-wasm.targets
index fcdcdad18e301c..12edd38bd05759 100644
--- a/src/libraries/sendtohelix-wasm.targets
+++ b/src/libraries/sendtohelix-wasm.targets
@@ -38,14 +38,12 @@
     </PrepareForBuildHelixWorkItems_WasmDependsOn>
 
     <BuildHelixWorkItemsDependsOn>$(BuildHelixWorkItemsDependsOn);StageEmSdkForHelix;PrepareForBuildHelixWorkItems_Wasm</BuildHelixWorkItemsDependsOn>
-    <BuildHelixWorkItemsDependsOn Condition="'$(WindowsShell)' != 'true'">$(BuildHelixWorkItemsDependsOn);DownloadFirefoxToSendToHelix</BuildHelixWorkItemsDependsOn>
     <IncludeHelixCorrelationPayload>false</IncludeHelixCorrelationPayload>
     <EnableDefaultBuildHelixWorkItems>false</EnableDefaultBuildHelixWorkItems>
 
     <!-- on unix CI has emscripten provisioned in $(EMSDK_PATH) as `/usr/local/emscripten`. -->
     <EMSDK_PATH Condition="$([MSBuild]::IsOSPlatform('WINDOWS')) and '$(EMSDK_PATH)' == ''">$(RepoRoot)src\mono\wasm\emsdk\</EMSDK_PATH>
     <EmSdkDirForHelixPayload>$([MSBuild]::NormalizeDirectory('$(RepoRoot)', 'src', 'mono', 'wasm', 'emsdk'))</EmSdkDirForHelixPayload>
-    <FirefoxForHelixPayload>$(TestArchiveRoot)firefox.zip</FirefoxForHelixPayload>
     <DebuggerHost Condition="'$(DebuggerHost)' == ''">chrome</DebuggerHost>
 
     <NeedsWorkload Condition="'$(Scenario)' == 'BuildWasmApps'">true</NeedsWorkload>
@@ -159,17 +157,18 @@
   <Target Name="PrepareHelixCorrelationPayload_Wasm">
     <Message Condition="'$(NeedsEMSDK)' == 'true' or '$(NeedsEMSDKNode)' == 'true'" Importance="High" Text="Using emsdk: $(EmSdkDirForHelixPayload)" />
 
-    <Error Condition="'$(NeedsToRunOnBrowser)' == 'true' and !Exists($(ChromeDir))"
+    <Error Condition="'$(NeedsToRunOnBrowser)' == 'true' and '$(DebuggerHost)' == 'chrome' and !Exists($(ChromeDir))"
            Text="Could not find chrome at $(ChromeDir)" />
-    <Error Condition="'$(NeedsToRunOnBrowser)' == 'true' and !Exists($(ChromeDriverDir))"
+    <Error Condition="'$(NeedsToRunOnBrowser)' == 'true' and '$(DebuggerHost)' == 'chrome' and !Exists($(ChromeDriverDir))"
            Text="Could not find chromedriver at $(ChromeDriverDir)" />
+    <Error Condition="'$(NeedsToRunOnBrowser)' == 'true' and '$(DebuggerHost)' == 'firefox' and !Exists($(FirefoxDir))"
+           Text="Could not find firefox at $(FirefoxDir)" />
 
     <ItemGroup Condition="'$(NeedsToRunOnBrowser)' == 'true'">
       <HelixCorrelationPayload Condition="'$(DebuggerHost)' == 'chrome'" Include="$(ChromeDir)" />
       <HelixCorrelationPayload Condition="'$(DebuggerHost)' == 'chrome'" Include="$(ChromeDriverDir)" />
 
-      <!--<HelixCorrelationPayload Condition="'$(WindowsShell)' != 'true' and '$(DebuggerHost)' == 'firefox'" Include="firefox" Uri="$(FirefoxUrl)" />-->
-      <HelixCorrelationPayload Condition="'$(WindowsShell)' != 'true' and '$(DebuggerHost)' == 'firefox'" Include="$(FirefoxForHelixPayload)" />
+      <HelixCorrelationPayload Condition="'$(WindowsShell)' != 'true' and '$(DebuggerHost)' == 'firefox'" Include="$(FirefoxDir)" />
     </ItemGroup>
 
     <ItemGroup Condition="'$(NeedsEMSDK)' == 'true'">
@@ -291,11 +290,4 @@
           DestinationFiles="@(_EmSdkFiles -> '$(EmSdkDirForHelixPayload)\%(RecursiveDir)%(FileName)%(Extension)')"
           SkipUnchangedFiles="true" />
   </Target>
-
-  <Target Name="DownloadFirefoxToSendToHelix" Condition="!Exists($(FirefoxForHelixPayload)) and '$(DebuggerHost)' == 'firefox'">
-    <DownloadFile SourceUrl="$(FirefoxUrl)" DestinationFolder="$(TestArchiveRoot)" SkipUnchangedFiles="true">
-      <Output TaskParameter="DownloadedFile" PropertyName="_DownloadedFile" />
-    </DownloadFile>
-    <Exec Command="tar -xf $(_DownloadedFile) -C $(TestArchiveRoot) &amp;&amp; rm $(_DownloadedFile) &amp;&amp; cd $(TestArchiveRoot) &amp;&amp; zip -q -r firefox.zip firefox"/>
-  </Target>
 </Project>
diff --git a/src/libraries/sendtohelix.proj b/src/libraries/sendtohelix.proj
index 60de339e34023a..6aca13e92bc10b 100644
--- a/src/libraries/sendtohelix.proj
+++ b/src/libraries/sendtohelix.proj
@@ -48,6 +48,7 @@
         HelixTargetQueues=$(HelixTargetQueues);
         BuildTargetFramework=$(BuildTargetFramework)
       </_PropertiesToPass>
+      <_DebuggerHosts Condition="'$(_DebuggerHosts)' == ''">$(DebuggerHost)</_DebuggerHosts>
       <_DebuggerHosts Condition="'$(_DebuggerHosts)' == ''">chrome</_DebuggerHosts>
     </PropertyGroup>
 
diff --git a/src/mono/sample/wasm/CommonAssemblyInfo.cs b/src/mono/sample/wasm/CommonAssemblyInfo.cs
new file mode 100644
index 00000000000000..9ad9b578f20649
--- /dev/null
+++ b/src/mono/sample/wasm/CommonAssemblyInfo.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly:System.Runtime.Versioning.SupportedOSPlatform("browser")]
diff --git a/src/mono/sample/wasm/Directory.Build.props b/src/mono/sample/wasm/Directory.Build.props
index 7382a6e5ce8f07..d03dbcf021398d 100644
--- a/src/mono/sample/wasm/Directory.Build.props
+++ b/src/mono/sample/wasm/Directory.Build.props
@@ -32,6 +32,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Compile Include="$(MSBuildThisFileDirectory)CommonAssemblyInfo.cs" />
+
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices\gen\Microsoft.Interop.SourceGeneration\Microsoft.Interop.SourceGeneration.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices.JavaScript\gen\JSImportGenerator\JSImportGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices\gen\LibraryImportGenerator\LibraryImportGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
diff --git a/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs b/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
index 5e87669e4cf68a..e1c5207659835e 100644
--- a/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
@@ -463,7 +463,7 @@ private static string GetNuGetConfigWithLocalPackagesPath(string templatePath, s
             return contents.Replace(s_nugetInsertionTag, $@"<add key=""nuget-local"" value=""{localNuGetsPath}"" />");
         }
 
-        public string CreateWasmTemplateProject(string id, string template = "wasmbrowser", string extraArgs = "")
+        public string CreateWasmTemplateProject(string id, string template = "wasmbrowser", string extraArgs = "", bool runAnalyzers = true)
         {
             InitPaths(id);
             InitProjectDir(_projectDir, addNuGetSourceForLocalPackages: true);
@@ -483,7 +483,10 @@ public string CreateWasmTemplateProject(string id, string template = "wasmbrowse
                     .ExecuteWithCapturedOutput($"new {template} {extraArgs}")
                     .EnsureSuccessful();
 
-            return Path.Combine(_projectDir!, $"{id}.csproj");
+            string projectfile = Path.Combine(_projectDir!, $"{id}.csproj");
+            if (runAnalyzers)
+                AddItemsPropertiesToProject("<RunAnalyzers>true</RunAnalyzers>");
+            return projectfile;
         }
 
         public string CreateBlazorWasmTemplateProject(string id)
diff --git a/src/mono/wasm/build/WasmApp.targets b/src/mono/wasm/build/WasmApp.targets
index 5cb9d26781b47f..a2031cab5457f2 100644
--- a/src/mono/wasm/build/WasmApp.targets
+++ b/src/mono/wasm/build/WasmApp.targets
@@ -120,6 +120,9 @@
   <ItemGroup>
     <!-- Allow running/debugging from VS -->
     <ProjectCapability Include="DotNetCoreWeb"/>
+
+    <SupportedPlatform Condition="'$(IsWasmProject)' == 'true'" Remove="@(SupportedPlatform)" />
+    <SupportedPlatform Condition="'$(IsWasmProject)' == 'true'" Include="browser" />
   </ItemGroup>
 
   <PropertyGroup Label="Identify app bundle directory to run from">
diff --git a/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestSuite.csproj b/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestSuite.csproj
index 68dd92779b0ead..d74faaeb66e2cb 100644
--- a/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestSuite.csproj
+++ b/src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestSuite.csproj
@@ -7,8 +7,9 @@
     <DebuggerHost Condition="'$(DebuggerHost)' == '' or ('$(DebuggerHost)' != 'chrome' and '$(DebuggerHost)' != 'firefox')">chrome</DebuggerHost>
     <DefineConstants Condition="'$(DebuggerHost)' == 'chrome'">$(DefineConstants);RUN_IN_CHROME</DefineConstants>
     <BrowserHost Condition="$([MSBuild]::IsOSPlatform('windows'))">windows</BrowserHost>
-    <InstallChromeForTests Condition="'$(InstallChromeForTests)' == '' and '$(DebuggerHost)' == 'chrome' and ('$(ContinuousIntegrationBuild)' == 'true' or Exists('/.dockerenv'))">true</InstallChromeForTests>
-    <InstallFirefoxForTests Condition="'$(DebuggerHost)' == 'firefox' and '$(InstallFirefoxForTests)' == '' and '$(ContinuousIntegrationBuild)' != 'true' and Exists('/.dockerenv')">true</InstallFirefoxForTests>
+    <_ProvisionBrowser Condition="'$(ContinuousIntegrationBuild)' == 'true' or Exists('/.dockerenv')">true</_ProvisionBrowser>
+    <InstallChromeForTests Condition="'$(InstallChromeForTests)' == '' and '$(DebuggerHost)' == 'chrome' and '$(_ProvisionBrowser)' == 'true'">true</InstallChromeForTests>
+    <InstallFirefoxForTests Condition="'$(InstallFirefoxForTests)' == '' and '$(DebuggerHost)' == 'firefox' and '$(_ProvisionBrowser)' == 'true'">true</InstallFirefoxForTests>
 
     <!-- Set RunSettingsFilePath property which is read by VSTest. -->
     <RunSettingsFilePath Condition="'$(ContinuousIntegrationBuild)' == 'true'">$(OutputPath).runsettings</RunSettingsFilePath>
diff --git a/src/mono/wasm/debugger/Wasm.Debugger.Tests/Wasm.Debugger.Tests.csproj b/src/mono/wasm/debugger/Wasm.Debugger.Tests/Wasm.Debugger.Tests.csproj
index 2dd8ac14f2bfcb..66490809749c87 100644
--- a/src/mono/wasm/debugger/Wasm.Debugger.Tests/Wasm.Debugger.Tests.csproj
+++ b/src/mono/wasm/debugger/Wasm.Debugger.Tests/Wasm.Debugger.Tests.csproj
@@ -37,6 +37,7 @@
                           ArchiveDirForHelix=$(TargetDir);
                           TestArchiveTestsDir=$(TestArchiveTestsDir);
                           ExtractTestClassNamesForHelix=$(ExtractTestClassNamesForHelix);
+                          DebuggerHost=$(DebuggerHost);
                           DotNetForTests=$([MSBuild]::NormalizePath($(DotNetRoot), $(DotNetTool)))" />
   </ItemGroup>
 
diff --git a/src/mono/wasm/templates/templates/browser/Properties/AssemblyInfo.cs b/src/mono/wasm/templates/templates/browser/Properties/AssemblyInfo.cs
new file mode 100644
index 00000000000000..9ad9b578f20649
--- /dev/null
+++ b/src/mono/wasm/templates/templates/browser/Properties/AssemblyInfo.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly:System.Runtime.Versioning.SupportedOSPlatform("browser")]
diff --git a/src/mono/wasm/templates/templates/console/Properties/AssemblyInfo.cs b/src/mono/wasm/templates/templates/console/Properties/AssemblyInfo.cs
new file mode 100644
index 00000000000000..9ad9b578f20649
--- /dev/null
+++ b/src/mono/wasm/templates/templates/console/Properties/AssemblyInfo.cs
@@ -0,0 +1,4 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+[assembly:System.Runtime.Versioning.SupportedOSPlatform("browser")]