Browser plug-in with content blocking and feedback capability

A computing system comprising:

• a processor and executable instructions accessible on a machine-readable medium that, when executed, cause the system to perform operations comprising:
• receive a markup language document from a network, the markup language document comprising an element that retrieves additional data from a server connected to the network;
• extract from the element a link to the additional data and an identifier associated with the additional data;
• compare the identifier against a list of identifiers stored locally on the system to identify whether a match exists between the identifier and an identifier on the list of identifiers;
• responsive to a match being identified, select at least one action to be performed based on the match;
• modify the link from its original form, the modification indicating the at least one action;
• and
• send at least a portion of the modified link to the server to inform the server of the at least one action.

A machine-readable medium having executable instructions encoded thereon, which, when executed by at least one processor of a machine, cause the machine to perform operations comprising:

• receive a markup language document from a network, the markup language document comprising an element that retrieves additional data from a server connected to the network;
• extract from the element a link to the additional data;
• retrieve the additional data based on the link;
• extract from the additional data an identifier associated with the additional data;
• compare the identifier against a list of identifiers stored locally on the machine to identify whether a match exists between the identifier and an identifier on the list of identifiers;
• responsive to a match being identified, select at least one action to be performed based on the match;
• and
• send decision data to the server to inform the server of the at least one action.