I prefer to use the Eclipse Marketplace, then you can also get updates for the plugin.
- Run eclipse
- Help → Eclipse Marketplace
- Search for "jQuery"
- Select JSDT jQuery 1.7.0 (or a newer version when it appears)
- Select Install
- Confirm the selected functions (make sure they are selected and click "Confirm")
- Accept the license and click Confirm
- Restart Eclipse
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