ublock origin, doesn't work reliably. It doesn't block ads on many websites, or it blocks them, but then the website isn't functional and doesn't work properly. You have to create a new issue for it on it's github.com website to ask the developer to give you lines of code to try and make it work on certain websites, that you have to manually add into the "my filters" area in it's settings, but the developer is rude, and doesn't like it when you complain that the add-on doesn't work. Also, the developer, github, and this firefox website, like to delete negative comments, because they don't want people to know that the add-on doesn't work properly. This could be a great add-on, if the developer would take the time to redesign it, and make sure it works properly with the newest types of ads that websites use.