Forking own repo in Mozilla Firefox causes browser crash

1. Start Firefox and navigate to bitbucket,.org and log in
2. Open an owned repository
3. Select the Fork option from the "..." dropdown menu
4. Observe that a few seconds after page load the browser crashes

Issue does not exist in Google Chrome

Environment: Mozilla Firefox 25 on Windows 8.1 Pro

Add-ons running:

• Adblock Plus
• Charles Autoconfiguration
• Download Statusbar
• Firebug
• Flash Firebug
• WOT