Summary of Bug

When using Firefox (tested with 24), certain attachments are unable to be loaded. During the first try to access the attachment, the popup is empty, and all subsequent tries to access the attachment will return an error : The requested content cannot be loaded. Please try again later.

Steps to reproduce

1. Use the image 'Unbenannt.png' (attached to this ticket) as an attachment in JIRA
2. Try to access the attachment

What we know

• Issue only happens when using Firefox (Chrome and IE works fine)
• The affected attachments are only .png image files
• Not all .png files are affected; new ones can be viewed fine. However, attachments that are at least a few days old will face this issue.
• In Firefox 24, and JIRA 5.2, (with their attachment) I could reproduce the behavior in my local instance (own data)
• In Firefox 24, JIRA 6.1, their attachment could be viewed fine
• In Chrome, the attachment could be viewed regardless of JIRA version