Hi, At start-up, with a new profile, Firefox creates more than 230 system compartments. This is about 90 more than a year ago, and it's part of the reason why Firefox uses almost twice as much physical memory at start-up than it did two years ago. (Have a look at https://areweslimyet.com/ for the measurements.)
At the bottom of this email I have listed the system compartments. (You can generate this list yourself from the 'js-main-runtime-compartments' tree in about:memory.) Please look for any there that you know could be created lazily. For example, there are 16 that have "devtools" in the name, which sound unnecessary. If you find some, please file a bug that blocks https://bugzilla.mozilla.org/show_bug.cgi?id=986323. Also, while modularization is admirable, compartments aren't free. So if you see any compartments that could be merged easily, please consider doing that as well. Thanks. Nick atoms null-principal [System Principal], about:blank [2] [System Principal], about:newtab [2] [System Principal], chrome://browser/content/baseMenuOverlay.xul [System Principal], chrome://browser/content/browser.xul [System Principal], chrome://browser/content/customizableui/panelUI.xml [System Principal], chrome://browser/content/customizableui/toolbar.xml [System Principal], chrome://browser/content/downloads/download.xml [System Principal], chrome://browser/content/places/menu.xml [System Principal], chrome://browser/content/places/placesOverlay.xul [System Principal], chrome://browser/content/search/search.xml [System Principal], chrome://browser/content/socialchat.xml [System Principal], chrome://browser/content/tabbrowser.xml [System Principal], chrome://browser/content/urlbarBindings.xml [System Principal], chrome://global/content/bindings/autocomplete.xml [System Principal], chrome://global/content/bindings/browser.xml [System Principal], chrome://global/content/bindings/button.xml [System Principal], chrome://global/content/bindings/general.xml [System Principal], chrome://global/content/bindings/menu.xml [System Principal], chrome://global/content/bindings/notification.xml [System Principal], chrome://global/content/bindings/popup.xml [System Principal], chrome://global/content/bindings/scrollbar.xml [System Principal], chrome://global/content/bindings/scrollbox.xml [System Principal], chrome://global/content/bindings/splitter.xml [System Principal], chrome://global/content/bindings/stringbundle.xml [System Principal], chrome://global/content/bindings/tabbox.xml [System Principal], chrome://global/content/bindings/textbox.xml [System Principal], chrome://global/content/bindings/text.xml [System Principal], chrome://global/content/bindings/toolbarbutton.xml [System Principal], chrome://global/content/bindings/toolbar.xml [System Principal], chrome://global/content/editMenuOverlay.xul [System Principal], chrome://global/content/platformHTMLBindings.xml [System Principal], data:application/vnd.mozilla.xul+xml;charset=utf-8,<window%20id='win'/> [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/devtools-clhandler.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/DownloadsStartup.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/ExperimentsService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/nsBrowserContentHandler.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/nsBrowserGlue.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/nsSessionStartup.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/nsSetDefaultBrowser.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/browser/components/WebContentConverter.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/addonManager.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/BrowserElementParent.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/CrashService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/DataReportingService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/FormHistoryStartup.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/InterAppCommService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/marionettecomponent.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/messageWakeupService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsContentPrefService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsCrashMonitor.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsDefaultCLH.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsHandlerService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsIDService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsLoginManager.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsPlacesAutoComplete.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsSearchService.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsUpdateServiceStub.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsUpdateTimerManager.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsUrlClassifierHashCompleter.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsUrlClassifierLib.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsUrlClassifierListManager.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/nsURLFormatter.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/PeerConnection.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/PushServiceLauncher.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/recording-cmdline.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/reftest-cmdline.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/TelemetryStartup.js [System Principal], file:///home/njn/moz/miN/co64/dist/bin/components/Weave.js [System Principal], inProcessTabChildGlobal?ownedBy=chrome://browser/content/browser.xul [2] [System Principal], inProcessTabChildGlobal?ownedBy=data:application/vnd.mozilla.xul+xml;charset=utf-8,<window%20id='win'/> [System Principal], resource://gre/modules/ActivitiesServiceFilter.jsm [System Principal], resource://gre/modules/ActivitiesService.jsm [System Principal], resource://gre/modules/AddonManager.jsm [System Principal], resource://gre/modules/addons/PluginProvider.jsm [System Principal], resource://gre/modules/addons/XPIProvider.jsm [System Principal], resource://gre/modules/AppDownloadManager.jsm [System Principal], resource://gre/modules/AppsUtils.jsm [System Principal], resource://gre/modules/AsyncShutdown.jsm [System Principal], resource://gre/modules/BackgroundPageThumbs.jsm [System Principal], resource://gre/modules/BookmarkJSONUtils.jsm [System Principal], resource://gre/modules/BrowserElementParent.jsm [System Principal], resource://gre/modules/BrowserElementPromptService.jsm [System Principal], resource://gre/modules/BrowserUtils.jsm [System Principal], resource://gre/modules/CharsetMenu.jsm [System Principal], resource://gre/modules/commonjs/sdk/core/heritage.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/core/namespace.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/core/promise.js [System Principal], resource://gre/modules/commonjs/sdk/platform/xpcom.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/system/events.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/util/array.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/util/object.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/sdk/util/uuid.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/commonjs/toolkit/loader.js [System Principal], resource://gre/modules/ContentPrefService2.jsm [System Principal], resource://gre/modules/ContentPrefStore.jsm [System Principal], resource://gre/modules/CrashManager.jsm [System Principal], resource://gre/modules/CrashMonitor.jsm [System Principal], resource://gre/modules/Credentials.jsm [System Principal], resource://gre/modules/ctypes.jsm [System Principal], resource://gre/modules/debug.js [System Principal], resource://gre/modules/DeferredTask.jsm [System Principal], resource://gre/modules/Deprecated.jsm [System Principal], resource://gre/modules/devtools/Console.jsm [System Principal], resource://gre/modules/devtools/dbg-client.jsm [System Principal], resource://gre/modules/devtools/DevToolsUtils.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/devtools/DevToolsUtils.jsm [System Principal], resource://gre/modules/devtools/event-emitter.js [System Principal], resource://gre/modules/devtools/event-emitter.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource://gre/modules/devtools/Loader.jsm [System Principal], resource://gre/modules/devtools/Require.jsm [System Principal], resource://gre/modules/devtools/SourceMap.jsm [System Principal], resource://gre/modules/DOMIdentity.jsm [System Principal], resource://gre/modules/DownloadCore.jsm [System Principal], resource://gre/modules/DownloadIntegration.jsm [System Principal], resource://gre/modules/DownloadList.jsm [System Principal], resource://gre/modules/Downloads.jsm [System Principal], resource://gre/modules/DownloadStore.jsm [System Principal], resource://gre/modules/FileUtils.jsm [System Principal], resource://gre/modules/FreeSpaceWatcher.jsm [System Principal], resource://gre/modules/FxAccountsClient.jsm [System Principal], resource://gre/modules/FxAccountsCommon.js [System Principal], resource://gre/modules/FxAccounts.jsm [System Principal], resource://gre/modules/FxAccountsUtils.jsm [System Principal], resource://gre/modules/IndexedDBHelper.jsm [System Principal], resource://gre/modules/InlineSpellChecker.jsm [System Principal], resource://gre/modules/LightweightThemeConsumer.jsm [System Principal], resource://gre/modules/LightweightThemeManager.jsm [System Principal], resource://gre/modules/Log.jsm [System Principal], resource://gre/modules/NativeApp.jsm [System Principal], resource://gre/modules/NetUtil.jsm [System Principal], resource://gre/modules/NewTabUtils.jsm [System Principal], resource://gre/modules/NotificationDB.jsm [System Principal], resource://gre/modules/OfflineCacheInstaller.jsm [System Principal], resource://gre/modules/osfile.jsm [System Principal], resource://gre/modules/osfile/osfile_async_front.jsm [System Principal], resource://gre/modules/osfile/osfile_native.jsm [System Principal], resource://gre/modules/osfile/osfile_shared_allthreads.jsm [System Principal], resource://gre/modules/osfile/osfile_unix_allthreads.jsm [System Principal], resource://gre/modules/osfile/ospath.jsm [System Principal], resource://gre/modules/osfile/ospath_unix.jsm [System Principal], resource://gre/modules/osfile/_PromiseWorker.jsm [System Principal], resource://gre/modules/PageThumbs.jsm [System Principal], resource://gre/modules/PermissionSettings.jsm [System Principal], resource://gre/modules/PermissionsInstaller.jsm [System Principal], resource://gre/modules/PermissionsTable.jsm [System Principal], resource://gre/modules/PlacesBackups.jsm [System Principal], resource://gre/modules/PlacesUtils.jsm [System Principal], resource://gre/modules/PluralForm.jsm [System Principal], resource://gre/modules/PopupNotifications.jsm [System Principal], resource://gre/modules/Preferences.jsm [System Principal], resource://gre/modules/PrivateBrowsingUtils.jsm [System Principal], resource://gre/modules/Promise.jsm [System Principal], resource://gre/modules/reflect.jsm [System Principal], resource://gre/modules/SafeBrowsing.jsm [System Principal], resource://gre/modules/ScrollPosition.jsm [System Principal], resource://gre/modules/Services.jsm [System Principal], resource://gre/modules/SocialService.jsm [System Principal], resource://gre/modules/SystemMessagePermissionsChecker.jsm [System Principal], resource://gre/modules/Task.jsm [System Principal], resource://gre/modules/TelemetryPing.jsm [System Principal], resource://gre/modules/TelemetryStopwatch.jsm [System Principal], resource://gre/modules/TelemetryTimestamps.jsm [System Principal], resource://gre/modules/ThirdPartyCookieProbe.jsm [System Principal], resource://gre/modules/Timer.jsm [System Principal], resource://gre/modules/UITelemetry.jsm [System Principal], resource://gre/modules/UpdateChannel.jsm [System Principal], resource://gre/modules/WebappOSUtils.jsm [System Principal], resource://gre/modules/Webapps.jsm [System Principal], resource://gre/modules/WindowDraggingUtils.jsm [System Principal], resource://gre/modules/WindowsPrefSync.jsm [System Principal], resource://gre/modules/XPCOMUtils.jsm [System Principal], resource:///modules/AboutHome.jsm [System Principal], resource:///modules/BrowserNewTabPreloader.jsm [System Principal], resource:///modules/BrowserUITelemetry.jsm [System Principal], resource:///modules/ContentClick.jsm [System Principal], resource:///modules/ContentLinkHandler.jsm [System Principal], resource:///modules/CustomizableUI.jsm [System Principal], resource:///modules/CustomizableWidgets.jsm [System Principal], resource:///modules/devtools/gDevTools.jsm [System Principal], resource:///modules/devtools/main.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource:///modules/devtools/profiler/consts.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource:///modules/devtools/profiler/controller.js (from: resource://gre/modules/commonjs/toolkit/loader.js:238) [System Principal], resource:///modules/devtools/scratchpad-manager.jsm [System Principal], resource:///modules/devtools/ViewHelpers.jsm [System Principal], resource:///modules/distribution.js [System Principal], resource:///modules/DownloadsCommon.jsm [System Principal], resource:///modules/DownloadsTaskbar.jsm [System Principal], resource:///modules/experiments/Experiments.jsm [System Principal], resource:///modules/NetworkPrioritizer.jsm [System Principal], resource:///modules/PanelWideWidgetTracker.jsm [System Principal], resource:///modules/PlacesUIUtils.jsm [System Principal], resource:///modules/RecentWindow.jsm [System Principal], resource:///modules/sessionstore/ContentRestore.jsm [System Principal], resource:///modules/sessionstore/FrameTree.jsm [System Principal], resource:///modules/sessionstore/GlobalState.jsm [System Principal], resource:///modules/sessionstore/PageStyle.jsm [System Principal], resource:///modules/sessionstore/PrivacyFilter.jsm [System Principal], resource:///modules/sessionstore/SessionCookies.jsm [System Principal], resource:///modules/sessionstore/SessionFile.jsm [System Principal], resource:///modules/sessionstore/SessionHistory.jsm [System Principal], resource:///modules/sessionstore/SessionSaver.jsm [System Principal], resource:///modules/sessionstore/SessionStorage.jsm [System Principal], resource:///modules/sessionstore/SessionStore.jsm [System Principal], resource:///modules/sessionstore/TabAttributes.jsm [System Principal], resource:///modules/sessionstore/TabStateCache.jsm [System Principal], resource:///modules/sessionstore/TabState.jsm [System Principal], resource:///modules/sessionstore/Utils.jsm [System Principal], resource:///modules/SignInToWebsite.jsm [System Principal], resource:///modules/Social.jsm [System Principal], resource:///modules/WebappManager.jsm [System Principal], resource:///modules/webrtcUI.jsm [System Principal], resource://pdf.js/default_preferences.js [System Principal], resource://pdf.js/network.js [System Principal], resource://pdf.js/PdfJs.jsm [System Principal], resource://pdf.js/PdfRedirector.jsm [System Principal], resource://pdf.js/PdfStreamConverter.jsm [System Principal], resource://services-common/async.js [System Principal], resource://services-common/hawkclient.js [System Principal], resource://services-common/hawkrequest.js [System Principal], resource://services-common/observers.js [System Principal], resource://services-common/rest.js [System Principal], resource://services-common/stringbundle.js [System Principal], resource://services-common/utils.js [System Principal], resource://services-crypto/utils.js [System Principal], resource://services-sync/constants.js [System Principal], resource://services-sync/util.js [System Principal], resource://shumway/ShumwayStreamConverter.jsm [System Principal], resource://shumway/ShumwayUtils.jsm [System Principal], XPConnect Junk Compartment _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
