For a more reliable test you can use https://dhe512.zmap.io/ . If the page doesn't load, then you are safe. Abrowser will give a "Secure Connection Failed" message when you aren't using the vulnerable algorithms. Otherwise you'll see the message "If you can view this page, your browser is vulnerable to the LogJam attack.".

https://weakdh.org/ relies on you not blocking stuff, like 3th party requests. The test works by trying to load https://dhe512.zmap.io/ using JavaScript, a page which requires the vulnerable algorithms. When it fails to load, the JavaScript reports that you are safe.

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