Abstract: A method and system provide, using a microprocessor of computing device associated with a web publisher, content including a web page. The method includes accessing, by the web publisher, a list including at least one extension associated with a web browser rendering the content at a second computing device, and a key generated based on the content, the key being generated at a specific time after the providing. The method includes comparing a value associated with the key to an expected value to determine a difference between the key and the expected value.

Abstract: A system includes a processor configured to execute a web browser in a first browser execution process initiated by an operating system of the system. The system includes a browser extension installed in the web browser, the browser extension including a markup language file and a file specifying at least one type of action related to a page element on which the browser extension seeks to act. The web browser may be configured to receive a set of rules from a web publisher associated with a first web page prior to rendering the first web page, determine based on the file, without loading the browser extension, that the browser extension is configured to implement a first action prohibited by the set of rules, and restrict the browser extension from implementing the first action on the first web page.

Abstract: A method and system provide, using a microprocessor of computing device associated with a web publisher, content including a web page. The method includes accessing, by the web publisher, a list including at least one extension associated with a web browser rendering the content at a second computing device, and a key generated based on the content, the key being generated at a specific time after the providing. The method includes comparing a value associated with the key to an expected value to determine a difference between the key and the expected value.

Abstract: Document load times may be determined by (a) accepting a first set of one or more document identifiers, (b) for each of the one or more document identifiers of the first set, requesting the document, downloading the document, and rendering the document, and (c) determining a first elapsed time from about the time of requesting a first document identified by the first set of one or more document identifiers to about the time of completion of the rendering of a last document identified by the first set of one or more document identifiers. This may be repeated for a second set of documents. For example, a first set of document(s) may be located at a first serving facility and the second set of document(s) may be located at a second serving facility.