Adblock plus is an amazing free add-on to the Firefox, Chrome, Oprea, Android and Internet Explorer browsers. It will block on the ads on a webpage (even Youtube and Facebook). That includes banner ads, pop-up ads, any kind of shilling is removed. Considering the average Canadian spends almost 44 hours a month online, that's a lot of possible marketing power that you can literally take away with a few clicks.
Many sites (rabble.ca included!) use ads to generate revenu. When those ads are blocked, it can be detrimental to the website's success. Adblock Plus is configurable, so it's easy to change your setting so that you see ads only on certain sites that you want to support or have very unintrusive ads.
Originally funded through donations, Adblock Plus is now making money through allowing sites with unintrusive ads to buy their way on to a whitelist. Although Adblock Plus is still a community project, many folks have found this problematic.
Alternatively, add-ons like Adblock Edge just block all ads indiscriminately like the original adblocker.