Does the Morningstar site indicate whether it might be looking for Java? I saw a reference to that in a question on Apple's forums last year (https://discussions.apple.com/thread/5861542). Since a login is required to access the Fund compare tool, I haven't tested it myself.

In the Question Details > More System Details next to your post, I see the Shockwave Flash plugin listed, but not Java, which probably is the second-most-used plugin on the web.

I don't know whether Mac users normally install Java through Apple or directly. An installer is available from Oracle (the source) here: https://www.java.com/en/download/manual.jsp

Note: make sure to avoid the Ask toolbar or whatever other offers may be included in the sequence of screens during installation. These are generally unwanted programs.

Assuming the page wants to use Java, after installing and reloading the page, you should see a notification icon in the address bar and probably (but not always) one of the following: a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page.

The plugin notification icon in the address bar typically looks like a small, dark gray Lego block. When the page wants to use a blocked plugin, the icon turns red to alert you to the concern.

To allow the site to use Java, you can go ahead and click the notification icon in the address bar. You can trust the site for the time being or permanently. After that, Firefox should run the Java content and the Java plugin itself usually will ask you whether the site can be trusted.

If there is still a problem,

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