Firefox has an odd error for lists that have the column-count style applied (-moz-column-count since this is still experimental). When a multi-column ordered list contains links the numbering of the last column can get corrupted when a link in that column is clicked.
Now, admittedly this is still an experimental feature, but it's probably a bug that needs to be addressed since this is expected implementation of the spec as it currently stands.
I've created a test-case to demonstrate the bug.
I'm rolling the dice and submitting the bug to bugzilla. Hopefully I won't make a fool of myself again.