A rose by any other name...

Shrewsbury - how is it pronounced?  As spelled, or Shrosebury?  I worked there for a time, and was always told that those who lived there pronounced it as Shrewsbury, and only outsiders pronounced it as Shrosebury.  But then, you can look at old maps going back to the 18th century where it is spelled Shrozebury so who's right?  And does it matter?  Can't we just accept it for the lovely historic market town it is?  A lot of fuss about nothing?