User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0 Build ID: 20180111124119 Steps to reproduce: Just go to bing.com and do repeated searches. Actual results: As I perform each additional search, I watch my memory usage skyrocket (upwards of 2gb) and CPU spikes too. Firefox noticeably slows as well. Expected results: I believe firefox should maintain speed and consistent memory doing something simple like a web search.

Hey Eric, do you see anything suspicious in the attached memory log?

(In reply to Panos Astithas [:past] (please ni?) from comment #1) > Hey Eric, do you see anything suspicious in the attached memory log? The overall memory usage in that report doesn't appear to be too high. Can we get a report when the memory usage spikes? I am seeing a ton of js zones, instead of one per script it's 5 Content Script jid1-OY8Xu5BsKZQa6A@jetpack Content Script {446900e4-71c2-419f-a6a7-df9c091e268b} Content Script uBlock0@raymondhill.net Content Script mozilla_cc3@internetdownloadmanager.com That's interesting but probably not that big of a deal. We can see most of the memory is in css strings: > 360.37 MB (100.0%) -- explicit > ├──170.74 MB (47.38%) -- js-non-window > │ ├──143.55 MB (39.83%) -- zones > │ │ ├──109.68 MB (30.44%) -- zone(0x19a80479000) > │ │ │ ├───63.83 MB (17.71%) -- strings > │ │ │ │ ├───0.38 MB (00.11%) ++ string(<non-notable strings>) > │ │ │ │ ├───0.13 MB (00.03%) ++ string(length=73092, copies=1, "data:text/css;charset=utf-8,COOKIE-ALERT%2C%0ACOOKIE-NOTICE%2C%0Acookie-permission%2C%0ACOOKIE-WARNING%2C%0Adiv%5Bdata-module%3D%22cookie_banner%22%5D%2C%0Adiv%5Belement-structure-cookiemonster%5D%2C%0AXK-COOKIE-POLICY-WARNING%2C%0Adiv%5Bid%3D%22__accept_cookie%22%5D%2C%0Adiv%5Bid%3D%22__ndcc_cookieImpliedConsent%22%5D%2C%0Adiv%5Bid%3D%22_cookieConsentWrapper%22%5D%2C%0Adiv%5Bid%3D%22_CookieText%22%5D%2C%0Adiv%5Bid%3D%22_iph_cp_popup%22%5D%2C%0Adiv%5Bid%5E%3D%22__ic-notice%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Fsmi2.net%2F%22%5D%2C%0Aembed%5Bsrc%3D%22http%3A%2F%2Fwww.xatech.com%2Fweb_gear%2Fchat%2Fchat.swf%22%5D%2C%0Aa%5Btitle%3D%22WhatsApp%20Newsletter%20Marketing%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Fclick.hotlog.ru%2F%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Fhitcounter.ru%2Ftop%2Fstat.php%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Fmetrika.yandex.ru%2Fstat%2F%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Ftop.mail.ru%2Fjump%22%5D%2C%0A%5Bhref%5E%3D%22http%3A%2F%2Ftop100.rambler.ru%2F%22%5D%2C%0A%5Bhref%5E%3D%22htt" (truncated)) This leads me to believe this is a dup of 1420485. We're trying to get that landed ASAP.