cronTab от Oktasoft

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."