Same problem here, issue persists in 62.0.3-1 for me.
- Bug#909818: firefox: Web Content is eating nearly 100% ... Norbert Preining
- Bug#909818: #909818, firefox: Web Content is eatin... Florian Apolloner
- Bug#909818: firefox: Web Content is eating nearly ... Simon Budig
- Bug#909818: firefox: Web Content is eating nearly ... Bert
- Bug#909818: firefox: Web Content is eating nea... Martin Steigerwald
- Bug#909818: firefox: Web Content is eating nearly ... Florian Apolloner
- Bug#909818: firefox: Web Content is eating nearly ... Pétùr
- Bug#909818: firefox: Web Content is eating nearly ... Pétùr
- Bug#909818: firefox: Web Content is eating nea... Florian Apolloner
- Bug#909818: fontconfig-2.13.1 causes Firefox slowd... akhilman
- Bug#909818: confirm downgrade of fontconfig solves... Francesco Potortì
