What are the most widely used browser for JIRA & Confluence? This information will be very handy as we plan our test cycles.
I don’t have any Atlassian-specific data, but I’m sure they follow global trends. The W3 Schools browser statistics are probably as good as any. They would indicate that your testing should include at least Chrome, Firefox, and IE/Edge, in that order.
What I do is to look at the browsers supported by Atlassian and test for those.