In the context of a co-browse session, one of the participants elects to include a screenshare task in which a screenshare of a browser window displaying a website will be provided to other participants of the co-browse session. When the screenshare task is started, a location of an address bar of the web browser is identified, optional pre-processing is applied to the image of the address bar, and a character recognition process, is used to determine the characters of the URL in the browser's address bar. The URL is compared with a list of allowed website URLs, and the screenshare session is selectively allowed only if the URL is contained in the list of allowed URLs. Once the URL has been approved, a slice of pixels the address bar is obtained and monitored for changes to the pixels that may indicate a change to the URL.