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Re:Firefox’s speed with large numbers of tabs leaves Chrome ... by geokon on Tuesday July 25, 2017 @12:36PM (#14849175)
I've narrowed it down to specific webpages - but how can I know if the leak is the pages' fault or the browser's fault?

(Biggest culprits are Discourse forums.. which is a shame b/c I really like the platform)

Re:Firefox’s speed with large numbers of tabs leaves Chrome ... by dblohm7 on Tuesday July 25, 2017 @12:41PM (#14849231)
about:memory will help you there. Save those reports (you can even anonymize them) and include them in a bug report.
Re:Firefox’s speed with large numbers of tabs leaves Chrome ... by nicoburns on Tuesday July 25, 2017 @12:39PM (#14849207)
You could try leaving the same website open in Chrome
Re:Firefox’s speed with large numbers of tabs leaves Chrome ... by jamesgeck0 on Tuesday July 25, 2017 @12:44PM (#14849287)
A couple weeks ago I'd've advised reporting those pages with the Pulse extension [1], but it looks like it's recently been retired.

1. https://testpilot.firefox.com/experiments/pulse

Re:Firefox’s speed with large numbers of tabs leaves Chrome ... by sp332 on Tuesday July 25, 2017 @01:02PM (#14849525)
Download Developer Edition https://www.mozilla.org/en-US/firefox/developer/ (or Nightly), load up the page, and in the browser menu click "Report Site Issue".