This extension will export individuals in your file to a standard vCard file (with extension vcf). These files can usually be imported into address or contacts software such as Apple's "Contacts" application.
When you run this extension, you will be asked it you want to export all records or just the currently selected records. For each option, you can also choose to export all of them or just those that have information on addresses. It normally does not make sense to fill a vCard file with individuals that have no address informaation. If an individual has multiple addresses, all of them will be included in their vCard.
This extension works well along with the "Address Book" browser style because that style is designed for displaying and editing residences (RESI events in GEDCOM) and their addresses
Each individual vCard in the exported file will include the following information (if available in the records):