Accessing various facebook walls and other pages sporadically involves one or more reloads. The reload is evident by seeing the progress in the address bar and the flash of the screen. Safari 5.0.2 does not have the problem, while build 67000 does have the problem. I didn't explore builds earlier than that.
Duplicate of bug 46324?
It's a dupe if you're noticing this happening when using the back button. For regular page-to-page and tab-to-tab navigation, I'm not noticing any behavior change between 5.0.2 and ToT (Facebook doesn't seem to trigger Quickling (their AJAX loading mode) for Safari user agents).
Does this still happen with the fix from bug 46324 (any build after r68742)?
I'm not able to reproduce now (and didn't hear anything in response to comment 3), so I'm going to assume that this was just a dupe of 46324. Please reopen if this still happens. *** This bug has been marked as a duplicate of bug 46324 ***