I use last firefox (32) on MacOS X 10.6.8. Sometime firefox start using 100% a one CPU, from that time the only way to stop it was to quit (it take severals seconds, sometime it hang). When it start i can close all windows, firefox continue using 100% CPU. I follow standard instructions (update to lastest, disable plugins and extensions...) it do not work. I not a configuration to reproduce the problem : keep iCloud mail open in one tab is the way to reproduce the problem sometime after a few minutes, sometime after some hours : but it also happend sometime with no iCloud open... Paramètres de base de l'application ----------------------------------- Nom: Firefox Version: 32.0.3 Agent utilisateur: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:32.0) Gecko/20100101 Firefox/32.0 Rapports de plantage des 3 derniers jours ----------------------------------------- Tous les rapports de plantage Extensions ---------- Nom: Firebug Version: 2.0.4 Activée: true ID: firebug@software.joehewitt.com Nom: Adblock Plus Version: 2.6.5 Activée: false ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} Nom: Copy Plain Text 2 Version: 1.3.2 Activée: false ID: copyplaintext@teo.pl Nom: DuckDuckGo Plus Version: 0.4.2 Activée: false ID: jid1-ZAdIEUB7XOzOJw@jetpack Nom: Lightbeam Version: 1.0.10.2 Activée: false ID: jid1-F9UJ2thwoAm5gQ@jetpack Nom: Readability Version: 2.4 Activée: false ID: {6005d9b1-d115-485a-a92a-3f6453ca3fe2} Accélération graphique ---------------------- Fenêtres avec accélération graphique: 1/1 OpenGL (OMTC) ID du périphérique: 0x9583 ID du vendeur: 0x1002 Rendu WebGL: ATI Technologies Inc. -- ATI Radeon HD 2600 PRO OpenGL Engine windowLayerManagerRemote: true AzureCanvasBackend: quartz AzureContentBackend: quartz AzureFallbackCanvasBackend: none AzureSkiaAccelerated: 0 Préférences modifiées importantes --------------------------------- accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 3 browser.history_expire_days.mirror: 180 browser.places.importBookmarksHTML: false browser.places.smartBookmarksVersion: 7 browser.search.useDBForOrder: true browser.sessionstore.upgradeBackup.latestBuildID: 20140923175406 browser.startup.homepage: about:newtab|http://www.charentelibre.fr/charente/pays-de-cognac/|http://www.sudouest.fr/charente/cognac/|https://www.ic browser.startup.homepage_override.buildID: 20140923175406 browser.startup.homepage_override.mstone: 32.0.3 dom.mozApps.used: true dom.w3c_touch_events.expose: false extensions.lastAppVersion: 32.0.3 font.internaluseonly.changed: false font.size.fixed.x-western: 12 font.size.variable.x-western: 14 gfx.blacklist.direct2d: 3 gfx.blacklist.layers.direct3d9: 3 gfx.blacklist.webgl.msaa: 4 network.cookie.prefsMigrated: true places.database.lastMaintenance: 1414486056 places.history.expiration.transient_current_max_pages: 104858 places.last_vacuum: 1341938581 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.adobepdfviewernpapi: 0 plugin.state.divxbrowserplugin: 0 plugin.state.flash: 1 plugin.state.flip4mac wmv plugin: 0 plugin.state.google earth web plug-in: 1 plugin.state.iphotophotocast: 1 plugin.state.silverlight: 0 print.macosx.pagesetup-2: PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPCFET0NUWVBFIHBsaXN0IFBVQkxJQyAiLS8vQXBwbGUvL0RURCBQTElTVCAxLjAvL0VO print.print_bgcolor: false print.print_bgimages: false print.print_colorspace: print.print_command: print.print_downloadfonts: true print.print_duplex: 0 print.print_evenpages: true print.print_in_color: true print.print_margin_bottom: 0.5 print.print_margin_left: 0.5 print.print_margin_right: 0.5 print.print_margin_top: 0.5 print.print_oddpages: true print.print_orientation: 0 print.print_page_delay: 50 print.print_pagedelay: 500 print.print_paper_data: 0 print.print_paper_height: 11.00 print.print_paper_name: print.print_paper_size: 0 print.print_paper_size_type: 1 print.print_paper_size_unit: 0 print.print_paper_width: 8.50 print.print_plex_name: print.print_printer: print.print_resolution: 0 print.print_resolution_name: print.print_reversed: false print.print_scaling: 1.00 print.print_shrink_to_fit: true print.print_to_file: false print.print_unwriteable_margin_bottom: 17 print.print_unwriteable_margin_left: 19 print.print_unwriteable_margin_right: 18 print.print_unwriteable_margin_top: 17 privacy.donottrackheader.enabled: true privacy.sanitize.migrateFx3Prefs: true security.warn_viewing_mixed: false storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1413879484 JavaScript ---------- Ramasse-miettes incrémentiel: true Accessibilité ------------- Activée: false Empêcher l'accessibilité: 0 Versions des bibliothèques -------------------------- NSPR Version minimale attendue: 4.10.6 Version utilisée: 4.10.6 NSS Version minimale attendue: 3.16.5 Basic ECC Version utilisée: 3.16.5 Basic ECC NSSSMIME Version minimale attendue: 3.16.5 Basic ECC Version utilisée: 3.16.5 Basic ECC NSSSSL Version minimale attendue: 3.16.5 Basic ECC Version utilisée: 3.16.5 Basic ECC NSSUTIL Version minimale attendue: 3.16.5 Version utilisée: 3.16.5 Fonctionnalités expérimentales ------------------------------