[Bug 1870827]

[Eric Jiang]

Dennis: there was a workaround posted in this bug thread that may help
you, namely, upgrade libfontconfig1 to 2.13.*. I am also on Ubuntu
18.04/Firefox 75 and this bug isn't causing me problems now. You will
probably have to grab a newer libfontconfig deb from a later release of
Ubuntu.

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https://bugs.launchpad.net/bugs/1870827

Title:
  Firefox hangs after simultaneously opening Chrome/Electron-based
  applications

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