SpawnDev.SpawnJS.BrowserExtension 2.2.1

Prefix Reserved
.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package SpawnDev.SpawnJS.BrowserExtension --version 2.2.1
                    


                    

                
NuGet\Install-Package SpawnDev.SpawnJS.BrowserExtension -Version 2.2.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="SpawnDev.SpawnJS.BrowserExtension" Version="2.2.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="SpawnDev.SpawnJS.BrowserExtension" Version="2.2.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="SpawnDev.SpawnJS.BrowserExtension" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add SpawnDev.SpawnJS.BrowserExtension --version 2.2.1
                    


                    

                
#r "nuget: SpawnDev.SpawnJS.BrowserExtension, 2.2.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package SpawnDev.SpawnJS.BrowserExtension@2.2.1
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=SpawnDev.SpawnJS.BrowserExtension&version=2.2.1
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=SpawnDev.SpawnJS.BrowserExtension&version=2.2.1
                    


                            Install as a Cake Tool

SpawnDev.SpawnJS.BrowserExtension

NuGet

SpawnDev.SpawnJS.BrowserExtension adds the ability for .Net WASM to run as a web browser Manifest V3 extension. .Net can run in all extension contexts. Runs in content context (in page with any site), popup window, options window, and the background.

Features

  • Manifest V3
  • Create a fully functional Manifest V3 web browser extension without writing a single line of Javascript
  • Multi-platform extension builds (Firefox, Chrome, etc)
  • Shared and platform specific manifest entries
  • .Net WASM runs in ALL extension contexts:
    • Background page (Firefox)
    • Background ServiceWorker (Chrome)
    • Content script
    • Options, Popup, etc
  • Background suspend/resume compatible for instant resume and power efficiency
  • Direct access to extension APIs via C#
    • Extension, Runtime, Tabs, Windows, Storage, etc

Dependencies

  • SpawnDev.SpawnJS - Enables full access to the Javascript environment, and Javascript class wrapping.
  • SpawnDev.SpawnJS.WebWorkers - Enables running Blazor WebAssembly in any web browser context, and inter-context communication.
Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
2.2.3 87 10/8/2026
2.2.2 85 10/6/2026
2.2.1 91 10/5/2026
2.2.0 103 10/1/2026
2.1.5 121 8/20/2026
2.1.4 111 8/20/2026
2.1.2 116 8/18/2026
2.1.1 133 8/18/2026
2.1.0 128 8/18/2026
2.0.4 119 8/17/2026
2.0.3 127 8/17/2026
2.0.2 119 8/16/2026
2.0.1 119 8/16/2026
2.0.0 117 8/15/2026
1.0.1 117 8/8/2026
1.0.0 111 8/7/2026

v2.2.1 - SpawnDev.SpawnJS 3.0.1. Firefox: a "background.scripts" background now runs as the BACKGROUND. GetExtensionMode recognized a Firefox background only by a page named background.html, but Firefox runs a scripts-based background in the page it generates (_generated_background_page.html), so it was taken for an extension page and its background services (runtime listeners such as onInstalled / onMessage) never started. An app that references SpawnDev.SpawnJS 3.0.0 directly gets NU1605 (downgrade): move it to 3.0.1.