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What Firefox version are you running? This sounds like Firefox bug 1411646, which should have been fixed in Firefox 58:

https://bugzilla.mozilla.org/show_bug.cgi?id=1411646

I'm on 59.0.1 (64-bit) for Ubuntu Artful (from the official repos). This is quite an odd bug, thanks for the link (and the link from the sibling comment). I'll keep an eye on the bug reports :)

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