Whindows Phone 8.1
is not possible install this packge in Windows phone 8.1.
Error Could not install package 'FireSharp 2.0.0'. You are trying to install this package into a project that targets 'WindowsPhoneApp,Version=v8.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author. 0
Any plans to support Windows 8.1
Check out https://github.com/step-up-labs/firebase-database-dotnet it support WP8.1 & Windows 8.1 and UWP
What is the reason not to support WP8.1? As I can see, Firesharp depends only on MS http client library and Newtonsoft json