title: Selenium not freeing up memory even after calling close/quit
body: <p>So I've been working on scraper that goes on 10k+pages and scrapes data from it.</p>
  <p>The issue is that over time, memory consumption raises drastically. So to overcome this - instead of closing driver instance only at the end of scrape - the scraper is updated so that it closes the instance after every page is loaded and data extracted.</p>
  <p>But ram memory still gets populated for some reason.</p>
  <p>I tried using PhantomJS but it doesn't load data properly for some reason.
  I also tried with the initial version of the scraper to limit cache in Firefox to 100mb, but that also did not work.</p>
  <p>Note: I run tests with both chromedriver and firefox, and unfortunately I can't use libraries such as requests, mechanize, etc... instead of selenium.</p>
  <p>Any help is appreciated since I've been trying to figure this out for a week now. Thanks.</p>