Okta releases browser plugins for IE and FireFox that allows SSO to saved webpages. Our users are notified when they login to the Okta portal that there is an update available. Often times before we can package up and deploy the update. It does look like you need access to an Okta account to download the plugins from the portal and I can't find a public link for them.
https://help.okta.com/en/prod/Content/Topics/Settings/download-browser-plugin.htm
I just wanted to let you all know we haven't forgotten about this request. We are working through some others at the moment that more unique customers are following. If any others come across this idea, please vote it up if it's one you would like to see added.