I'll note for anyone sticking with 10.7 that the Safari 6 upgrade is not easy to downgrade if you prefer version 5. There are indirect hints in advance, namely that v. 5.1.7 for Lion can no longer be downloaded from Apple and the fact that v. 6 is only available using Software Update (that's not a temporary thing as the Safari page notes "The latest version of Safari for Lion is available through Software Update.")
But install it I did. It seemed fine in the hour I used it. Speed seemed improved (expected), the installation didn't require a restart (that's new), and bookmarks are even more of a second-class citizen than before (happens with every release). But I wanted to revert to the earlier version, mostly because of one little feature of Glims I use often that broke (an Add Bookmark Here item which can be shown in bookmark folders—combined with a utility like Keyboard Maestro it enables quick, folder-specific bookmarking).
I had already downloaded the 5.1.7 installer for Lion from a third-party software site. Installer.app wouldn't proceed since I had a newer version of Safari. So I used Terminal to delete Safari.app since that usually allows an installation to proceed when downgrading. Nope.
At that point I figured it's looking at something in /System/Library where WebKit frameworks are installed. That's not a place I figure I should be messing around too much, especially since other applications like Mail and iTunes also use WebKit. So I copied a clone from just before the Safari upgrade back to my boot volume.
Not a problem on my end, but perhaps something others using 10.7 might want to know.
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