Bad Unicode Character Display on JIRA Web Interface using Firefox


  • There are some missing icon or image in the User Interface (UI) and showing something like bad unicode character
  • Other browser (Firefox) on other machines works fine
  • Problem only occurs on a particular browser and happen to all JIRA including Atlassian Support System and Atlassian JIRA Public Bug Tracking
  • The user interface is showing something similar like the following screenshot



  • Switching browser character encoding has no effect on the issue
  • Private browsing does not work



  • It is because the following is set in prefs.js which can be set in Options > Advanced Font Setting
user_pref("browser.display.use_document_fonts", 0);


  1. Go to Options > Content tab > Advanced Font settings 
  2. Tick or enable "Allow pages to choose their own fonts, instead of my selections above"
Last modified on Feb 19, 2016

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