Earlier quoted context omitted.
yeah right! i don't know very much how to use a computer so i asked my cousin who is a professional hacker haha to set up the programs i use! i was blaffed to know that he installed a plug-in (that's how you spell it right?) that blocked all the ads that would appear in a website! how could i enjoy surfing the web without ads? real life has ads everywhere i go, so i called him immediately and ordered that he removed…
Since you appear to want to learn, I won't feel bad (or pedantic) in explaining that he installed an extension, which is a browser add-on. A plug-in is also a browser add-on, but is used to describe QuickTime, Flash, Java, etc. After I wrote the above, I double checked myself and, apparently, I am using Mozilla's definition. However, it seems Apple also differentiates among the terms add-on (the super-set), and exten…