Can't view pdf files in safari but can in webkit nightly

Apologies if this post is a duplicate. Have tried searching without success.
Using Safari Version 5.1.7 (6534.57.2) on OS X 10.6.8 (Macbook Air) when I click a PDF link, it is downloaded and then I need to double click to open in Preview.
However, if I use the nightly build of WebKit (http://nightly.webkit.org) — currently Version 5.1.7 (6534.57.2, r121825) — it is opened in the same tab within the browser.
I do not have Adobe Reader/Acrobat installed thus do not have the Adobe plugins in the "Internet Plugins" folder (system or user).
Can anyone explain this difference? Does the production build of Safari not have a built-in PDF viewer? Or maybe there is another reason...

Does the production build of Safari not have a built-in PDF viewer?
Yes, it does.
Or maybe there is another reason...
There is: you damaged your operating system by installing pre-release software intended only for developers. Back up, erase the boot volume, reinstall the Mac OS, and restore your data.

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