screenshot

Steps to reproduce:

1.Open a page with Ve
2.Select a text
3.Apply Superscript
4.Apply Strikethrough
5.Apply Underline
6.Unselect superscript
7.Make it superscript again (Observe that strikethrough is now below the text, this is one issue)
8.Unselect Underline
9.Make it underline again

Observed Result
The Strikethrough and Underline gets overlapped for a superscript text

This is a FireFox only bug.Works perfectly on Chrome

Test Environment: https://test2.wikipedia.org/
Browser: FF 25
OS: MAC OS X 10. 8. 5
https://test2.wikipedia.org/w/index.php?title=3rdfebFF&veaction=edit

Version: unspecified
Severity: normal

Attached: