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See open URLs per Safari Web Content instance in Activity Monitor System 10.9
I believe this is new to Mavericks: Here's an easy way to identify the windows in Safari that are currently using resources.

Open Activity Monitor, and then hover over a Safari Web Content item in the window. That will display the open URL(s) belonging to that instance. This makes it easy to identify the window in Safari that is using up your CPU.

Lex adds: This works as described, and is great.
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Mavericks - Finally a service to open a terminal from a specific folder System 10.9
Right mouse click and choose Services > New Terminal at Folder

I've tried different apps to be able to open a Terminal shell from a specific folder. Finally in Mavericks you can add a Service to do that. In System Preferences choose Keyboard and then Shortcuts. From the left side nav, choose Services. Then from the main area under Files and Folders, choose New Terminal at Folder and/or New Terminal Tab at Folder. Now you can right mouse click or control click on a folder and choose Services > New Terminal at Folder.
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Drag Finder Window's Proxy Icon to add tab System 10.9
A new tab can be added to a Finder window that already has tabs by dragging a folder's proxy icon to the plus sign that appears in the tabbed window.

You probably know you can drag the proxy icon of a Mavericks Finder window to another Finder window's tab to move or copy it to the tab's folder. You can add the folder as a tab to a Finder window that already has tabs if you drag its proxy icon to the plus (+) icon next to the right-most tab of the tabbed window.
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Mavericks: Zooming images and PDFs in Quick Look is back System 10.9
In Mac OS X 10.9 Mavericks, the functionality to zoom in and out of PDFs in Quick Look is back: Press and hold the Option key while scrolling with two fingers.

Moreover, the images in Quick Look can be zoomed in to actual size by just pressing the option key.

Unfortunately, it is no longer possible to select text from text files in Quick Look.
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Show Additional Monitor Resolutions in Mavericks System 10.9
Mavericks offers a lot less resolution options in the "Scaled" list than 10.8 or earlier did. This can be a particularly severe problem if the resolutions that it thinks your projector supports are not, in fact, supported by it at all, as was the case with my setup.The fix for showing the extended list of possible resolutions in Mavericks is undocumented, so far as I can find, but incredibly easy:

In the Displays preference pane, hold down the option key and click the "Scaled" radio button. This will toggle on and off additional resolutions for the device (including more scaled resolutions for the built-in display in MacBooks).

I'm not aware of any radio button ever having worked that way before, so it's easy to miss.

If your external display isn't showing an image at all because the OS got its "native" resolution wrong, you will of course have to click the "Gather Windows" button at the bottom of the preference pane to bring the window for the blanked-out display over to the working one, where you can then option-click it and select a good resolution.
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Recurring "UI element scripting is not enabled." in Mavericks AppleScript System 10.9
If you use AppleScript applets to interact with UI elements, you may quickly find out that in Mavericks all seems to be broken. Every run results in System Preferences being opened to the pane that used to control UI Element Scripting, and finding the new controls in Security & Privacy -> Privacy -> Accessibility seems to have no effect.

This is a result of Mavericks splitting UI control authorization into per-app settings, combined with the Lion feature of remembering what windows an app had open when it was last closed.
  • Mavericks recognizes the app uniquely only as long as the app doesn't change.
  • WindowState information is stored in the app if you have permissions to modify it.
These two features end up caught in a fight.

The following Terminal command will prevent this by passing ownership of the applet to root and blocking you from editing it without authenticating.

sudo chown -R root:wheel AppletName.app

References:
OS X: Using AppleScript with Accessibility and Security features in Mavericks

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