Why will jQuery not load in Facebook?

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The Chrome console does not appear to have access to the content script’s execution context.

Wrong, it does. You need to look at the correct place:

Animation of how-to get access to the execution environment of the Chromne extension

The previous screencast shows that the Console tab of the Chrome developer tools has two dropdown boxes at the bottom, which can be used to change the execution environment for the developer tools’ console.
The left side can be used to change the frame context (top frame, so iframe, …), and the right side can be used to change the script context (page, content script, …).

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