seguendo questa guida
https://www.tecmint.com/speed-firefox-linux/ ho messo in false i seguenti parametri e disattivato la
Raccolta e utilizzo dati di Firefox, e così facebook non mi freeza
browser.download.animateNotifications
security.dialog_enable_delay
browser.newtabpage.activity-stream.telemetry
browser.newtabpage.activity-stream.feeds.telemetry
browser.ping-centre.telemetry
toolkit.telemetry.bhrPing.enabled
toolkit.telemetry.archive.enabled
toolkit.telemetry.firstShutdownPing.enabled
toolkit.telemetry.reportingpolicy.firstRun
toolkit.telemetry.hybridContent.enabled
toolkit.telemetry.newProfilePing.enabled
toolkit.telemetry.unified
toolkit.telemetry.shutdownPingSender.enabled
toolkit.telemetry.updatePing.enabled