"Version 41 of the Firefox web browser ships with memory improvements that benefit all users of the browser but Adblock Plus users especially.Source: gHacks Tech News
"When Mozilla ran memory tests against a set of popular Firefox add-ons recently it noticed that the popular extension Adblock Plus was adding an average of 60-70 Megabytes to the browser's memory usage.
"It discovered furthermore that certain conditions could increase memory usage extremely so that the overall use of memory by Firefox would double, triple or even quadruple while sites remained open in the browser. ..."
Details Firefox 41 ships with massive memory improvements for Adblock Plus