Facebook container uses 100% of CPU for about a second

[andreicristianpetcu]

• Facebook Container Version: 2.1.0
• Operating System + Version: Windows 10
• Firefox Version: Firefox Nightly from today
• Other installed Add-ons + Version + Enabled/Disabled-Status: Amazon.com 1.1 true amazondotcom@search.mozilla.org Bing 1.1 true bing@search.mozilla.org Bitwarden - Manager de parole gratuit 1.43.3 true {446900e4-71c2-419f-a6a7-df9c091e268b} Certificate Viewer for Humans 1.7.0 true {13c639b4-1c39-478e-8f12-34f03412f43c} COVID-19 Știri Oficiale 1.1.4 true {2164fef6-64f4-4a8b-9a6d-9dd9c500dd88} DuckDuckGo 1.0 true ddg@search.mozilla.org Facebook Container 2.1.0 true @contain-facebook Filter AwesomeBar 1.2.1 true {a8d88d84-27e6-427e-a165-175ff8627e5d} Firefox Lockwise 2.2.4-alpha true lockbox@mozilla.com Gecko Profiler 0.30 true geckoprofiler@mozilla.com Google 1.0 true google@search.mozilla.org Mobile Wikipedia (WebExtension) 1.1.2 true {57746d5b-5156-4bf1-b79d-996d23a5c49e} Notes by Firefox 4.3.5 true notes@mozilla.com Privacy Labrador 0.4.0 true {f1c6690b-e778-438c-b424-00cf30c6ffdd} Search and Switch Containers 1.7.0 true {cdbfc05c-3a99-460e-ba11-11ec4b71f789} SlackRedirectRemover 1.2.2 true {bda98ef7-e155-40b7-a06f-f76e05919911} Snowflake 0.2.2 true {b11bea1f-a888-4332-8d8a-cec2be7d24b9} Temporary Containers 1.8 true {c607c8df-14a7-4f28-894f-29e8722976af} Toggle Pin Tab 1.0.0 true {0ccbb198-ca03-4b1c-bc9c-cd0de758239d} uBlock Origin 1.25.2 true uBlock0@raymondhill.net Wikipedia (ro) 1.0 true wikipedia@search.mozilla.org YouTube™ Repeat Button 0.1.2 true {28c18e92-ab27-403f-973d-49d1d0fa7665} Zoom Scheduler 2.1.7 true {bf855ead-d7c3-4c7b-9f88-9a7e75c0efdf} About Sync 0.0.52 false aboutsync@mhammond.github.com Bye Rupert 1.0.3 false {f461f6ed-efe0-45a8-aab4-c92ed1a9de4f} Chrome Store Foxified 3.4 false Chrome-Store-Foxified@jetpack Dark Scroll 2.0.0 false {759d3eb8-baf1-49e0-938b-0f963fdac3ae} Extension source viewer 1.6.11 false crxviewer-firefox@robwu.nl Firefox Lightbeam 2.1.0 false jid1-F9UJ2thwoAm5gQ@jetpack Firefox Multi-Account Containers 6.2.3 false @testpilot-containers Form Filler 2.11.1 false {7efbd09d-90ad-47fa-b91a-08c472bdf566} FoxyTab 2.15 false foxytab@eros.man Incompat 1.2.2 false {a98179d1-9b4e-47d0-838f-d10097a3166f} Lighthouse 100.0.0.2 false {cf3dba12-a848-4f68-8e2d-f9fadc0721de} React Developer Tools 4.5.0 false @react-devtools Redux DevTools 2.17.1 false extension@redux.devtools Temp Mail - Disposable Temporary Email 0.0.28 false {2d97895d-fcd3-41ab-82e6-6a1d4d2243f6} Youtube Dark Purple 0.9.7 false jid1-8N68vRDhzgyGfg@jetpack Enable:

Actual behavior

Windows says Firefox is using Very Hight CPU. I recorded a profile and it points to Facebook Container as one of the causes: Short interval 100% CPU https://perfht.ml/2Ww8GTV Full interval 34% CPU : https://perfht.ml/38WDaAL

Expected behavior

Not use so much CPU

Steps to reproduce

Normal browsing.

[maxxcrawford]

Could you please profile this with ONLY Facebook Container extension running?

[jbwharris]

I see similar behaviour on Firefox 77.0b9 for Mac. I'll be using FF, no problems. Then if I want to use Facebook it'll essentially lock up my computer for probably 30-45 seconds on initial load. Then Facebook will work fine. If I leave that tab for awhile and come back to refresh Facebook, same thing happens again.