cronTab is a Firefox Addon which open the specified URL in a new tab at the specified time. Format: minute(0-59) hour(0-23) week(0-6) URL Aliases: {sun:0, mon:1, tue:2, wed:3, thu:4, fri:5, sat:6} Expressions: * all values , separate values - define ranges / step values Example 1: 30 12 * http://example.com "At 12:30, open example.com." Example 2: */5 9,17 1-5 http://example.net "At every 5th minute past hour 9 and 17 on every day from Monday through Friday, open example.net."