Yes, Silo supports OAuth natively. See below for more details.
What is OAuth?
OAuth provides client applications a secure delegated access to server resources on behalf of a resource owner. It specifies a process for resource owners to authorize third-party access to their server resources without sharing their credentials. OAuth essentially allows access tokens to be issued to third-party clients by an authorization server, with the approval of the resource owner, or end-user. The client then uses the access token to access the protected resources hosted by the resource server. OAuth is commonly used as a way for Internet users to log into third party websites using their Microsoft, Google, Facebook or Twitter accounts without exposing their password.
Silo and OAuth
Silo is a secure hosted browsing environment where exposure to browser executed code is insulated from the end-user by the architecture of the service. Within this environment, Silo uses a customized version of Mozilla Firefox as the browser. Firefox natively supports OAuth. Therefore, Silo supports OAuth in as much as Firefox does.
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