LibX is not working with any current browsers. Both Firefox and Chrome have removed LibX from their extension stores.
Consider trying EZproxy Redirect as an alternative. It provides a button to send any page to the UCF EZproxy for more convenient access to the UCF Libraries' online collection.
EZproxy Redirect offers partial replacement for some of the LibX functionality. It allows you to send any page to the UCF EZproxy, for more convenient access to UCF Library subscriptions.
After installing EZproxy Redirect, make sure to select University of Central Florida in the Extension Options.