would that stop all the videos I want to watch? I go to MLB.com to watch game day a lot, and watch videos on youtube as well.
IF you are referring to Flash ads, you can install Click To Flash for Safari to disable them. If you go to a website to watch a flash video (tv episode, maybe?) just click on the grey Flash icon to enable the video.
To Install: Click on "Safari" and select "Extensions" from the drop down.
To turn it on/off: Click on "Safari" and select "Preferences". Go to Extensions tab.
Absolutely. Browser plug-ins are platform agnostic (work on all the platforms). There are exceptions to this (there's a Firefox extension that opens content in a new tab using IE that only works on Windows for instance) but 99% of them work without fault across the operating systems supported by the browser.There IS Ad-block plus for mac, Firefox and Safari. Same place you get it for pc.
Won't effect You Tube - not flash video.
Youtube probably won't admit it, but the majority of their videos are still flash, unless you force html5 video. I've been running without Flash for over a year now and most YouTube videos still wouldn't play. I found a Safari Extension that will force html5 videos and now I can watch previously unplayable videos.