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How can I make Firefox 57 use the System Font for UI?

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Since the Update to Firefox 57 the UI seems to have switched to Fira Sans which is not my System UI Font. Changing the System Font also has no effect on the UI of Firefox. I am on Fedora 27.

Since the Update to Firefox 57 the UI seems to have switched to Fira Sans which is not my System UI Font. Changing the System Font also has no effect on the UI of Firefox. I am on Fedora 27.
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