NOTE: This bug does *NOT* occur in Chrome.

Prerequisites: 

1) Enough bibs loaded in the database having the same shelving location such that several pages of results will display. 
2) AdvancedSearchTypes must include

    loc

Steps to reproduce:
1/ Navigate to OPAC advanced search page in firefox or IE
2/ Click on ShelvingLocation tab
3/ Select one of the available locations and click search.
   (examples below are using the location CDB)
4/ Note that the breadcrumb is in the form
   Results of search  with limit(s): 'mc-loc:'CDB'',
   The URL contains limit=mc-loc%3ACDB
5/ Click Next
6/ Breadcrumb shows Results of search  with limit(s): 'mc-loc:''CDB'''
   URL contains limit=mc-loc%3A%27CDB%27

Every time you click Next, another layer of quotes is added around the shelving location in the breadcrumbs:

'mc-loc:'CDB''
'mc-loc:''CDB'''
'mc-loc:'''CDB''''

And the shelving location is nested a layer deeper in %27:

limit=mc-loc%3ACDB
limit=mc-loc%3A%27CDB%27
limit=mc-loc%3A%27%27CDB%27%27