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Firefox 55.0.3 not displaying correct website fonts, other browsers do

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Firefox 55.0.3 is not displaying the correct headline fonts on this site www.upskills.co.nz. It defaults to Times New Roman. The correct font is Source Sans Pro; which is a Google font, correctly loaded in css and loads correctly in Chrome and other browsers including mobile. Only Firefox is not displaying it correctly. Why?

Firefox 55.0.3 is not displaying the correct headline fonts on this site www.upskills.co.nz. It defaults to Times New Roman. The correct font is Source Sans Pro; which is a Google font, correctly loaded in css and loads correctly in Chrome and other browsers including mobile. Only Firefox is not displaying it correctly. Why?

Chosen solution

Could be that, or Ctrl+Shift+r bypasses cached files, so perhaps Firefox was stubbornly clinging to an old version of the CSS file and now that has been resolved.

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Could you open Firefox's Network Monitor, click the Domain column to sort the Google stuff together, and look at the status of the requests? I have three successful requests, as shown in the attached screenshot. (After a reload bypassing cache -- Ctrl+Shift+r.) What do you get?

Info on Network Monitor: https://developer.mozilla.org/docs/Tools/Network_Monitor

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The strangest thing is that as soon as I refreshed with network monitor running the font loaded properly. Clearly there is a quantum observer effect at play.

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Chosen Solution

Could be that, or Ctrl+Shift+r bypasses cached files, so perhaps Firefox was stubbornly clinging to an old version of the CSS file and now that has been resolved.