Data processing

A method of operation of a web browser running on a client device connectable to the internet, the method comprising:

• accessing a list providing one or more groups of internet addresses of online retailer internet pages, each group having two or more internet addresses each relating to different respective retailers' offerings of an item for purchase, so that if information derived from a current internet address being accessed by the web browser relates to such a group of internet addresses, the other internet addresses in the group are returned as alternative internet addresses relating to a current item being viewed;
• detecting a retail price of the current item from each of the internet addresses in the group;
• and
• comparing the retail prices and indicate the lowest such retail price for the current item while displaying the internet page relating to the current internet address on a display.

A computer readable medium storing computer software for execution by a data processing system connectable to the internet, so that, when executed by the data processing system the software causes a web browser of the data processing system to carry out the steps of:

• accessing a list providing one or more groups of internet addresses of online retailer internet pages, each group having two or more internet addresses each relating to different respective retailers' offerings of an item for purchase, so that if information derived from a current internet address being accessed by the web browser relates to such a group of internet addresses, the other internet addresses in the group are returned as alternative internet addresses relating to a current item being viewed;
• detecting a retail price of the current item from each of the internet addresses in the group;
• and
• comparing the retail prices and indicate the lowest such retail price for the current item while displaying the internet page relating to the current internet address on a display.

A data processing system, comprising:

• a processing unit;
• a memory coupled to the processing unit;
• and
• executable instructions stored in the memory and configured for execution on the processing unit, wherein the executable instructions are configured to implement a method of operation of a web browser, the method comprising:
• accessing a list providing one or more groups of internet addresses of online retailer internet pages, each group having two or more internet addresses each relating to different respective retailers' offerings of an item for purchase, so that if information derived from a current internet address being accessed by the web browser relates to such a group of internet addresses, the other internet addresses in the group are returned as alternative internet addresses relating to a current item being viewed;
• detecting a retail price of the current item from each of the internet addresses in the group;
• and
• comparing the retail prices and indicate the lowest such retail price for the current item while displaying the internet page relating to the current internet address on a display.