Does having a query string attached to a URL cause browsers to never cache it? For instance,  my site does something like this:/radar-picture.png?v=sep2013And it would appear that FireFox never caches that picture; it is downloaded on every request. I'd like FireFox to cache it, for as long as it wants to. I only want to force it to download when the v= parameter has changed.
URL with query disables caching?
cache;query string