Stay strong, my friend, we all have good and bad days. Look positively at this experience, now you know your weak areas and what you need to work on. Do not blame yourself, you are the person who deserves the most of your empathy and care and love. Try to self-reflect and understand the real reasons why you did it, why you looked for porn actresses looking like your colleague. I somehow missed your story about her, and last time I was reading your blog I still could not find it, so not sure what the connection is between two of you.
Actually, I do not use any extensions now. One of the things that helped me stay more or less clean last year is that I had to show a lot of things to different people on my private laptop, and if I had in my browser history some porn websites names, that would have been embarrassing. But then I still watched porn occasionally, making sure that I deleted the browser history before going out of home. So, still not the best option.
I use Google Chrome both on my Android phone and my laptop, and the add-ins I was using were Personal Blocklist (by Google), BlockSite and Windscribe - Free Proxy and Ad Blocker. The problem with these services is that sometimes they block normal websites as well. So this is why you need to ensure that you store the password somewhere if you really need to access the website. However, you have to ensure that you stand the temptation to watch porn once you entered the password.
For me, the best thing that works is to be out of home as much as possible and to be so busy that when you come home, the only thing you can think of is to go to sleep. Otherwise, if you are at home, and you do not have any plans or deadlines, it is difficult to think of something else except the old destructive habit.
But for sure, for all people who have PIED, the main problem is the psychological one. Because be it porn or be it masturbation, it is an addiction. The thing that works for me now is that I told myself 'Stop! You are not getting any younger and by doing it even once, you bring your all problems back, let us say, 20 days. And you need 20 days more to recover. This way you are never getting over your problem. And all your dreams will never realize.' Just we need to remind ourselves that there are no ways for even one-second glances. Also, I have 100 days till the year end of being porn and masturbation free, so these round numbers sometimes stimulate your desires because if I do it at least once, all the streak will be gone.
And finally, for me there are no ideal women anymore. Before, I used to put them on a pedestal, and was making them a center of the universe, forgetting about my own needs and that there is still life without woman in it. Now, after many disappointments, I think of the majority of women badly, be it their fidelity, their selfishness, their woke culture, their double standards, etc. Yes, I think there are still good women existing on the planet, but either I do not like them for some reasons like their physical appearance, or they won't like me as I am today and would not accept me with the luggage of problems I bring with myself, let us just be realists. So, I care about none of them now, and would not imagine myself with any of them. Of course, it is not a good trait and might be quite cynical, but at least it helps me in my journey as I made it work for me.