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Fonts missing in Firefox 53 under Ubuntu GNOME 17.04 when Roboto fonts are not installed

Summary

All the fonts are missing when GitLab is opened in Firefox 53 under Ubuntu GNOME 17.04 and Roboto fonts are not installed.

Steps to reproduce

  • Make sure you're running latest Firefox (v53 at the time of writing this) in fresh Ubuntu GNOME 17.04 installation.
  • Navigate to GitLab.com
  • See if text is shown on the page.

What is the expected correct behavior?

Page should available system font in case Roboto font is not available.

Screenshots

Default Page View

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When font-family property is disabled.

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Output of checks

This bug happens on GitLab.com

Possible fixes

This issue is fixed if Roboto is removed from fonts stack, or is replaced with Noto Sans (which is successor of Roboto with better UNICODE support, and default font on Android 5+).