[Len Case]

Due to security considerations, certain content is not supposed to be cached--and any such content will not be taking up room on your disk.

However, for cacheable content, the hidden preference for workspaces only affects the initial load of the workspace. Beyond that, using the back/forward buttons already prefers cached content. However clicking on links does not.

We ought to be able to add such a feature relatively easily, but it was not a priority when we were trying to ship 5.5.