Documentation for JIRA 5.1.x. Documentation for other versions of JIRA is available too. 
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The JIRA logo ' ' is displayed in the user's browser to identify the JIRA browser tab. To use a custom image for your JIRA site:
<jira-installation-directory>/atlassian-jira/images/icons directory (assuming you are using a 'recommended' distribution of JIRA).favicon.pngfavicon.png with your custom PNG image.<jira-installation-directory>/atlassian-jira/favicon.icoUsers may need to clear their browser cache to view the new image.