This extension searches the documentation locally! You can use it without an internet connection, but you have to download the documentation once (it downloads it automatically by running this extension with the cmd key).
You can see the best results at the top, and some results, which could be interesting with a lower opacity. Removed jQuery functions get a red cross and deprecated functions an exclemation mark sign.
You can start a search by writing "$.SEARCH" or "$ NAME" (with a space). When you run an item you will be redirected to a local documentation page with your default browser (also works without internet connection).