One of the small things that makes it easier to jump around JIRA for me are two bookmarks that we setup in our office. This should work for any instance, just save the following as your bookmark URL. Be sure to update [YourSubDomain] to match your environment.
JIRA Issue Finder
This will allow you to enter in an issue key and jump straight to that issue in a new tab. This is not case sensitive.
JIRA Project Versioning
This will take you straight to the version page of a project for quick updates/releases. This IS case sensitive. If you do not use uppercase for the Project Key it will fail.