You may find it more useful to build a stack of pages visited in a persistent array. This can be tricky within a single window, but if you are prepared to use a frameset, you can create a global session store for such things. That way you'd be able to traverse a logical history rather than the possibly random page ordering that the user navigated.

Warnings:

• The UniversalBrowserRead privilege is required to access this property value.

Property attributes:

ReadOnly.