Phishing is an internet fraud that aims to steal sensitive information like usernames, passwords, and credit card numbers. Though phishing may be a straightforward social engineering attack, it's proved to be amazingly effective. Hence, the amount of phishing scams is continuing to grow, and also the prices of the ensuing damages is increasing. Researchers moreover because the IT trade has known the imperative want for anti-phishing solutions and recently, a number of solutions to mitigate phishing attacks are proposed. many of those approaches square measure browser plugins. In 2005, we tend to enforce a Firefox anti-phishing browser plug-in referred to as AntiPhish. when cathartic AntiPhish, we determined to port it to the Microsoft web adventurer (IE) browser. Supporting i.e. was vital as a result of a majority of web users area unit accessing the net with this browser. Our initial expectation at the start of the project was that porting a browser plug-in that's written for Firefox to i.e. couldn't be too difficult; in spite of everything, browser plug-ins area unit conceptually similar. However, creating an associate degree-phishing browser plug-in for the i.e. tested to be much more difficult than expected. during this paper, we report on our expertise in implementing anti-phishing (i.e., security) browser plug-ins and summarize 5 lessons we tend to learn from our endeavor.