If your extension needs to interact with web pages, then it needs a content script. A content script is some JavaScript that executes in the context of a page that's been loaded into the browser.

你希望可以和网页互交，内容脚本必不可少，一个内容脚本可以对加载在浏览器中的网页处理，把内容脚本当作加载网页的一部分吧，不是扩展的一部分。

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Read the script, and make a note card that can help you remember the content.

读一下讲稿，并制作笔记卡以帮助你记住内容。

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Listing 4 contains the content of this script.

清单4包含该脚本的内容。

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For live shows, second screen content creation happens when script ideas hit the page.

ENGADGET: The state of the second screen: Will TV companion apps proliferate or dwindle?