![]() Many pages have multiple iframes, so this can add up quickly. Second, there’s an overhead of about 4 MiB per iframe, which is mostly due to ABP injecting a giant stylesheet into every iframe. (This is on 64-bit builds on 32-bit builds the number is probably a bit smaller.) This appears to be mostly due to additional JavaScript memory usage, though there’s also some due to extra layout memory. ![]() ![]() Mozilla developer Nicolas Nethercote explains why ABP is so CPU- and memory-intensive:įirst, there’s a constant overhead just from enabling ABP of something like 60–70 MiB. But its ad-blocking benefits come with a price: very high CPU and memory usage, which could be a big problem if you're surfing around on a computer without high-end resources. AdBlock Plus is the most popular extension for Mozilla Firefox and Google Chrome.
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