Real-time monitoring of ads inserted in real-time into a web page

A computer-implemented method for monitoring of web browser media object(s) received in response to a web browser request at a web browser rendering a web page, the method executed by at least one processor of a client terminal in network communication with a web server hosting the web page, the method comprising:

• loading by a web browser running on the client terminal, ad-monitoring code with the web page, wherein the web page includes at least one designation for placement of at least one web browser media object received in response to a web browser request by the web browser;
• monitoring, using the ad-monitoring code, at least one of actions and events driven by the at least one web browser media object;
• identifying a deviation from a set-of-rules according to an analysis of the monitored at least one of actions and events, wherein the set-of-rules define at least one of allowable and prohibited actions and events of the at least one web browser media object;
• and
• at least one of filtering and outputting an indication of the at least one web browser media object identified as deviating from the set-of-rules.