If the web resource is rather extensive (for example the home page of a website) or not really part of the current context you might consider using the 'Show in a new browser window or browser tab' option. The exact behavior is determined by the browser options.
Invocation option 'In a new browser window or browser tab'
This is a nice option to browse the web resource while keeping the current HelpServer browser page intact.
web resource shown in a new browser window
web resource shown in a new browser tab