An advanced quick find section gets added in side navigation bar on all set-up pages. Select the code component that you want to go to, then start typing the name of the code,an autocomplete suggestion pops up, select the one that you want to go to.
1) Salesforce's REST API is used to accomplish the above functionalities
2) A similar addon on chrome browser also exists. You can donwload it here : https://chrome.google.com/webstore/detail/salesforce-advanced-code/lnkgcmpjkkkeffambkllliefdpjdklmi