Yes, all browsers, consistently.
Search for a staff member (such as The Duke). Go to the "User" tab of results (in this case, The Duke is on page 4, 5th result).
I expected his username to be bold and red, as his profile and posts are:
Instead, I am given no indication that this is a staff member of the forum.
The default is currently to have all usernames bold and blue. However, since this is the formatting for editors, perhaps the default should be unbold and blue (as they are formatted on the forum).