The favicon can be changed following the instructions found here: https://support.atlassian.com/jira-cloud-administration/docs/configure-the-look-and-feel-of-jira-applications/
This did not take on the last post. Here are the instructions from the link.
How to change the faviconThe favicon appears typically to the left of your browser's URL field, and on browser tabs displaying a page on your Jira site. To upload a favicon, make sure it's in PNG format, with dimensions of 32x32 pixels, 71x71 DPI, and with 8-bit color depth.
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