1. A method comprising: operating a web server to receive a call to an anti-injection client-side code from a web browser, wherein the call is facilitated by a code segment in a web page loaded by the web browser; and transmitting the anti-injection client-side code from the web server to the web browser, wherein the anti-injection client-side code comprises instructions which, when executed by the web browser: (i) intercept an injection of a node into the DOM (Document Object Model) of the web page, (ii) compare the injected node with a list, and (iii) based on the comparison, permit or block execution of the injected node in the web browser.