I also dabbled with Opera and Waterfox, amongst others, but for a number of years it was Firefox that delivered web pages to me. Like many tech journalists (and non-journalists for that matter), I gave up on Internet Explorer quite some time ago, opting for Firefox initially. Is AdBlock Plus killing the web? Massive memory usage is dragging Firefox downĪs something of a browser butterfly, I like to keep an eye on what's happening with browsers other than the one I'm currently using fulltime. Nethercote only tested ABP’s memory consumption in Firefox, but we performed the same test in Chrome and got the same results. In an extreme example, the VIM Color Scheme Test website - which has hundreds of iframes - goes from a few hundred megabytes of memory to almost two gigabytes.
In Nethercote’s testing, he found that TechCrunch used around 194MB of RAM without ABP enabled - but that doubled to 417MB with ABP enabled, after triggering all of the social widgets. On the ExtremeTech homepage there are 10, which is pretty low. On a modern website, there can be dozens of iframes. You can probably see where this is going. The most common example is the ubiquitous social sharing widget (Facebook, Twitter, etc.) which is actually an iframe containing a separate webpage hosted on Facebook/Twitter’s servers. This wouldn’t be a problem if we were still in the ’90s or early ’00s, but nowadays it is very common for a webpage to have lots of iframes, which are separate, individual webpages that are loaded and embedded within the page you’re currently looking at. Basically, ABP inserts a massive CSS stylesheet - occupying around 4MB of RAM - into every single webpage that you visit, stripping out the ads.
The main problem, though, is the process by which ABP actually blocks ads.
To begin with, according to Mozilla developer Nicholas Nethercote, there is a 60-70MB memory hit having Adblock Plus run in the background on Firefox. Basically, ABP has grown too big for its own good, and just the very process of running ABP in your web browser consumes more memory and CPU cycles than it saves. Unfortunately, the actual situation is a lot more complex than that. This might seem counterintuitive at first - after all, ABP blocks all of those annoying animated Flash ads from loading, and so it should save you from unnecessary memory and CPU hits. Instead of making web surfing more responsive, ABP actually makes your surfing experience slower. Furthermore, ABP also increases the amount of time (and CPU cycles) required to render a website. Here’s a lovely bit of irony for you: Adblock Plus, which is by far the most popular add-on for Firefox and Chrome, is actually increasing the amount of memory used by your web browser, rather than decreasing it. Webroot® Legacy Products (2011 and Prior) 33.
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