Screenshot attached

Steps to reproduce;

1.Open a page with VE
2.Add a bullet list or a numbered list
3.Keep on pressing the Add or decrease indentation button for a bullet point

Observed Result:
"Confirm Navigation?" dialog box are showing up .

See the screenshot attached.

Test Environment: mw.org
Browser: Chrome Version 26.0.1410.65 & FF25
OS: MAC OS X 10. 8. 5
Page:https://www.mediawiki.org/w/index.php?title=User:RYasmeen_(WMF)&veaction=edit

Version: unspecified
Severity: normal

Attached: