Adblock Plus is probably the reason Firefox and Chrome are such memory hogs
People are using µBlock now for precisely this reason.<p><a href="https://github.com/gorhill/uBlock/wiki/%C2%B5Block-vs.-ABP:-efficiency-compared" rel="nofollow">https://github.com/gorhill/uBlock/wiki/%C2%B5Block-vs.-ABP:-...</a><p><a href="https://chrome.google.com/webstore/detail/%C2%B5block/cjpalhdlnbpafiamejdnhcphjbkeiagm?hl=en" rel="nofollow">https://chrome.google.com/webstore/detail/%C2%B5block/cjpalh...</a>
<a href="https://github.com/gorhill/uBlock" rel="nofollow">https://github.com/gorhill/uBlock</a>