You are viewing extension docs in chrome via the 'file:' scheme: are you expecting to see local changes when you refresh? You'll need run chrome with --allow-file-access-from-files.
paramName
( optional enumerated Type array of paramType )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Google Chrome Extensions (Labs)

Hello There!

Hello There!

This documentation tells you how to write Google Chrome Extensions — small software programs that can modify and enhance the functionality of the Google Chrome browser.

Where to start

Before you write an extension, read these:

Getting Started (Hello, World!)
Build a simple "Hello, World" extension in about 5 minutes
Overview
Learn about the fundamental design points of the extension system

Also check out these:

Doc versions

In general, you should view these pages at http://code.google.com/chrome/extensions/<filename> (for example, http://code.google.com/chrome/extensions/overview.html). However, if you need to see the very latest doc or you're using a different version of Google Chrome than most of the world is (perhaps the Dev channel), you might want to use a different URL (for example, .../extensions/dev/overview.html). The following table lists the doc locations and explains how they differ.

URL Version
.../extensions/... The version you should probably be using. This documents the most stable version of the extension API.
.../extensions/beta/...

Documentation for the Beta channel version of Google Chrome.

Note: APIs on the Beta channel are subject to change.

.../extensions/dev/...

Documentation for the Dev channel version of Google Chrome. This version might also have bug fixes and feature information that are relevant to the current doc but haven't been integrated into it yet.

Note: APIs on the Dev channel are subject to change.

.../extensions/trunk/... The very latest documentation. Look here if you're using a tip-of-tree version of Chromium or if you're curious about features to come. This version might also have bug fixes and feature information that are relevant to the current doc but haven't been integrated into it yet.

Note: The trunk version of the doc is preliminary and might have errors.