I just closed a bunch of tabs, and according to about:memory, I've still got some Twitter pages open (which I don't). Attaching my memory report. Here's my about:support: Application Basics ------------------ Name: Firefox Version: 50.0a1 Build ID: 20160710030217 Update Channel: nightly User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0 OS: Windows_NT 6.1 Multiprocess Windows: 1/1 (Enabled by user) Safe Mode: false Crash Reports for the Last 3 Days --------------------------------- Report ID: bp-7d25b004-0d11-4924-b68f-6348d2160711 Submitted: 2 days ago Report ID: bp-62f4e726-7c37-4c0d-804f-43cf72160711 Submitted: 2 days ago Report ID: bp-fc75be6e-efec-428a-b096-a39132160711 Submitted: 2 days ago Report ID: bp-9d5ddaf0-3aac-44db-8145-8ae4c2160711 Submitted: 2 days ago Report ID: bp-8d56035a-8930-49c5-bbf9-fd9cf2160711 Submitted: 2 days ago All Crash Reports Extensions ---------- Name: Activity Stream Version: 1.1.0 Enabled: true ID: @activity-streams Name: Chrome Store Foxified Version: 2.1 Enabled: true ID: Chrome-Store-Foxified@jetpack Name: Cycle Collector Graph Analyzer, about:cc Version: 0.0.1 Enabled: true ID: cycle.collector.graph.analyzer@pettay.fi Name: DOM Inspector Version: 2.0.16.1-signed Enabled: true ID: inspector@mozilla.org Name: Firefox Hello Version: 1.4.2 Enabled: true ID: loop@mozilla.org Name: FlyWeb Version: 1.0.0 Enabled: true ID: flyweb@mozilla.org Name: Imgur Uploader Version: 1.0.6.1-signed Enabled: true ID: giorgio@gilestro.tk Name: Integrated Google Calendar Version: 1.5.1 Enabled: true ID: intgcal@egarracingteam.com.ar Name: Mass Password Reset Version: 1.05.1-signed.1-signed Enabled: true ID: masspasswordreset@johnathan.nightingale Name: Mozilla Tree Status Version: 1.0.2 Enabled: true ID: mozilla-tree-status@jsantell.com Name: Multi-process staged rollout Version: 1.0 Enabled: true ID: e10srollout@mozilla.org Name: Pocket Version: 1.0.4 Enabled: true ID: firefox@getpocket.com Name: RB DoubleClick Version: 0.0.1 Enabled: true ID: rb-doubleclick@mikeconley.ca Name: Reviewboard Collapser Version: 1.0 Enabled: true ID: reviewboard-collapser@webextensions Name: Statuser Version: 0.1.4 Enabled: true ID: @statuser Name: tab-crasher Version: 0.1.1-signed.1-signed Enabled: true ID: jid1-KrxrrWKPOoE4Mw@jetpack Name: Test Pilot Version: 0.7.2-tag-2016-07-05 Enabled: true ID: @testpilot-addon Name: Tilt Version: 1.0.1.1-signed.1-signed Enabled: true ID: tilt@mozilla.com Name: Web Compat Version: 1.0 Enabled: true ID: webcompat@mozilla.org Name: wontfix Version: 1.0 Enabled: true ID: jid1-SDCOUnA2RvYHFg@jetpack Name: 'Sup Son Version: 0.1.1 Enabled: false ID: @sup-son Name: about:addons-memory Version: 10.1-signed.1-signed Enabled: false ID: about-addons-memory@tn123.org Name: Add-on Compatibility Reporter Version: 2.0.6.1-signed.1-signed Enabled: false ID: compatibility@addons.mozilla.org Name: australis-bugzilla-widget Version: 0.1 Enabled: false ID: jid1-Z6r2SFr66RSx4Q@jetpack Name: Beyond Australis Version: 1.4.6 Enabled: false ID: thefoxonlybetter@quicksaver Name: Bugzilla Tweaks Version: 1.12.1.1.1-signed.1-signed.1-signed Enabled: false ID: jid0-qBnIpLfDFa4LpdrjhAC6vBqN20Q@jetpack Name: Buttons Back Version: 8.1-signed.1-signed Enabled: false ID: buttonsback@darktrojan.net Name: Change Max Rows of Autocomplete In URL Bar Version: 1.4.1-signed.1-signed Enabled: false ID: jid0-PTmUBsaKAokPOYNMcrQbssRkn7Y@jetpack Name: Check4Change Version: 1.9.8.1 Enabled: false ID: check4change-owner@mozdev.org Name: Context Search Compact Version: 0.1.0 Enabled: false ID: context-search-compact@2k1dmg.org Name: Counter for Mozilla's End of Year Fundraising Version: 0.0.5 Enabled: false ID: mofofuraco@archaeopteryx Name: Cycle Collector Analyzer, about:ccdump Version: 0.4.3.1-signed.1-signed Enabled: false ID: ccdump@getfirebug.com Name: DevEdition theme enabler Version: 1.0 Enabled: false ID: devedition-theme-enabler@tim-addons.com Name: dontbeevil Version: 1.1.1.1-signed.1-signed Enabled: false ID: jid0-uKv2BxxWlXSDahl79DjVU4yqsvY@jetpack Name: Drumpfinator Version: 0.9.5 Enabled: false ID: drumpfinator@xulforge.com Name: Feature Recommender Version: 0.1.0 Enabled: false ID: cfr-moz@insights.mozilla.org Name: feedly Version: 16.0.528.1-signed.1-signed Enabled: false ID: feedly@devhd Name: Firefox Interest Dashboard Version: 0.9.1.1-signed.1-signed Enabled: false ID: firefox.interest.dashboard@up.mozilla Name: FireGestures Version: 1.10.9 Enabled: false ID: firegestures@xuldev.org Name: geckoprofiler Version: 1.16.16 Enabled: false ID: jid0-edalmuivkozlouyij0lpdx548bc@jetpack Name: Ghostery Version: 6.3.1 Enabled: false ID: firefox@ghostery.com Name: GitHub Extension Installer Version: 1.7.0 Enabled: false ID: {86054B0A-BD85-42F9-8E58-8794EC6F6EA1} Name: Greasemonkey Version: 3.8 Enabled: false ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781} Name: Heartbleed Monitor Version: 0.2.1.1-signed.1-signed Enabled: false ID: jid1-eMhaOaq3SPBFDg@jetpack Name: LastPass Version: 3.3.1 Enabled: false ID: support@lastpass.com Name: Lightbeam Version: 1.3.0.1-signed Enabled: false ID: jid1-F9UJ2thwoAm5gQ@jetpack Name: Media Hint Version: 0.1.13.1 Enabled: false ID: mediahint@jetpack Name: MemChaser Version: 0.7.1-signed Enabled: false ID: memchaser@quality.mozilla.org Name: Modify Headers Version: 0.7.1.1.1-signed.1-signed Enabled: false ID: {b749fc7c-e949-447f-926c-3f4eed6accfe} Name: Muditanist Version: 0.1.1-signed.1-signed Enabled: false ID: jid1-oyNpUQcL3f9kyg@jetpack Name: New Tab Override (browser.newtab.url replacement) Version: 3.0 Enabled: false ID: newtaboverride@agenedia.com Name: Nicer Bugzilla Comments Version: 1.4.1.1-signed.1-signed Enabled: false ID: jid0-8OJNdDJ6MBHtfB9FElhQ3wt2FMw@jetpack Name: No Twitter Moments Version: 1.1 Enabled: false ID: no-twitter-moments@mikeconley.ca Name: Noise Control Version: 16 Enabled: false ID: jid1-hUBct1DNfZQIeQ@jetpack Name: NoScript Version: 2.9.0.11 Enabled: false ID: {73a6fe31-595d-460b-a920-fcc0f8843232} Name: Open in Browser Version: 1.17 Enabled: false ID: openinbrowser@www.spasche.net Name: Profilist Version: 1.2.1-signed Enabled: false ID: Profilist@jetpack Name: Puzzle Bars Version: 2.1.14 Enabled: false ID: thePuzzlePiece@quicksaver Name: Remote XUL Manager Version: 1.3.1 Enabled: false ID: remotexulmanager@xulforge.com Name: Restartless Restart Version: 9.1-signed.1-signed Enabled: false ID: restartless.restart@erikvold.com Name: Shumway Version: 0.11.617 Enabled: false ID: shumway@research.mozilla.org Name: skiptco Version: 1.2.1.1-signed.1-signed Enabled: false ID: plugin@skiptco.org Name: SnoozeTabs Version: 0.1.1 Enabled: false ID: jid1-snoozetabs@jetpack Name: Soundcloud Player Version: 0.9.1-signed.1-signed Enabled: false ID: soundcloud-player@mikedeboer.nl Name: SQLite Manager Version: 0.8.3.1-signed.1-signed Enabled: false ID: SQLiteManager@mrinalkant.blogspot.com Name: Tab Badge Version: 2 Enabled: false ID: badge@darktrojan.net Name: Tab Data Version: 0.5.10.1 Enabled: false ID: jid1-4ogjq7MUzAiCOw@jetpack Name: Tabsmack Version: 0.5.0 Enabled: false ID: jid1-CzCFymQL7Znp9g@jetpack Name: TabSubmit Version: 1.0.2.4.1-signed.1-let-fixed.1-signed Enabled: false ID: {421e87b4-d3d2-49c8-b08f-b83f4dc88444} Name: TabSubmit Basic Version: 0.2.1.1-signed.1-signed Enabled: false ID: jid1-KR7YJG7ASAuPHQ@jetpack Name: TART - Tab Animation regression Test Version: 1.0 Enabled: false ID: bug848358@mozilla.org">bug848358@mozilla.org Name: Terms of Service; Didn’t Read Version: 0.4.1.1-signed.1-signed Enabled: false ID: jid0-3GUEt1r69sQNSrca5p8kx9Ezc3U@jetpack Name: Test Pilot Version: 1.2.3.4 Enabled: false ID: testpilot@labs.mozilla.com Name: test-widget Version: 0.1 Enabled: false ID: jid1-ahoQUEjmds0TqQ@jetpack Name: Textarea Cache Version: 0.9.3.4 Enabled: false ID: {578e7caa-210f-4967-a0d3-88fe5b59a39f} Name: The Addon Bar (restored) Version: 3.2.9-compat-fixed-4 Enabled: false ID: the-addon-bar@GeekInTraining-GiT Name: The Grim Tab Reaper Version: 0.2.1-signed.1-signed Enabled: false ID: jid1-VOwFjnJ0krddcw@jetpack Name: TinEye Reverse Image Search Version: 1.2.1 Enabled: false ID: tineye@ideeinc.com Name: Toggle animated GIFs Version: 1.3 Enabled: false ID: giftoggle@simonsoftware.se Name: Toggle Paint Flashing Version: initial.rev7.1-signed.1-signed Enabled: false ID: jid0-vUWmQUzNnMcAZ6NPmhAEmMjI66M@jetpack Name: Toolbar Autohide Version: 6.7.2 Enabled: false ID: fullscreentoolbarhover@com.sppad Name: Translate This! Version: 3.5.0 Enabled: false ID: jid0-k75TfRGfOXPHfEZmJ9cKu5eCgLc@jetpack Name: User Agent Overrider Version: 0.4.1 Enabled: false ID: useragentoverrider@qixinglu.com Name: Visual Hashing Version: 0.3.1-signed.1-signed Enabled: false ID: jid1-NzIEzRc5sYX4Ww@jetpack Name: Wallflower Version: 1.5.1.1-signed.1-signed Enabled: false ID: jid1-uB4sJEPvR2m4QQ@jetpack Name: WCAG Contrast checker Version: 1.5.1.1-signed.1-signed Enabled: false ID: colorchecker@colorcheckerniquelao.net Name: web_clipper Version: 6.2.0 Enabled: false ID: {E0B8C461-F8FB-49b4-8373-FE32E9252800} Name: ZenHub Version: 2.20.5 Enabled: false ID: zenhub@zenhub.io Graphics -------- Features Compositing: Direct3D 11 Asynchronous Pan/Zoom: wheel input enabled; touch input enabled WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics P3000 Direct3D11 vs_4_1 ps_4_1) Hardware H264 Decoding: No; Hardware video decoding disabled or blacklisted Direct2D: true DirectWrite: true (6.2.9200.17568) GPU #1 Active: Yes Description: Intel(R) HD Graphics P3000 Vendor ID: 0x8086 Device ID: 0x010a Driver Version: 9.17.10.4101 Driver Date: 1-30-2015 Drivers: igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32 Subsys ID: 04981028 RAM: Unknown Diagnostics AzureCanvasAccelerated: 0 AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo Decision Log OPENGL_COMPOSITING: Blocklisted; failure code BLOCKLIST_FEATURE_FAILURE_INTEL_OGL_DIS Important Modified Preferences ------------------------------ accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.hashstats_reported: 1 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.download.importedFromSqlite: true browser.download.manager.alertOnEXEOpen: true browser.places.smartBookmarksVersion: 8 browser.search.useDBForOrder: true browser.sessionstore.upgradeBackup.latestBuildID: 20160710030217 browser.startup.homepage: resource://activity-streams/data/content/activity-streams.html#/ browser.startup.homepage_override.buildID: 20160710030217 browser.startup.homepage_override.mstone: 50.0a1 browser.tabs.remote.autostart: true browser.tabs.remote.autostart.2: false browser.tabs.warnOnOpen: false browser.urlbar.userMadeSearchSuggestionsChoice: true dom.allow_XUL_XBL_for_file: false dom.apps.lastUpdate.buildID: 20160710030217 dom.apps.lastUpdate.mstone: 50.0a1 dom.apps.reset-permissions: true dom.disable_open_during_load: false dom.mozApps.maxLocalId: 1008 dom.mozApps.runUpdate: false dom.mozApps.used: true dom.mozContacts.enabled: true dom.mozTCPSocket.enabled: true dom.push.userAgentID: 3f551ac990a54b38ae3be50f9a7756b1 dom.w3c_touch_events.expose: false extensions.lastAppVersion: 50.0a1 font.internaluseonly.changed: true gfx.crash-guard.d3d11layers.appVersion: 43.0a1 gfx.crash-guard.d3d11layers.deviceID: 0x010a gfx.crash-guard.d3d11layers.driverVersion: 9.17.10.3517 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.glcontext.gfx.driver-init.direct3d11-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-d3d11: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-warp: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-try-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d9video: 2 gfx.crash-guard.status.glcontext: 2 gfx.direct3d.last_used_feature_level_idx: 0 gfx.driver-init.appVersion: 43.0a1 gfx.driver-init.deviceID: 0x010a gfx.driver-init.driverVersion: 9.17.10.3517 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 media.benchmark.vp9.fps: 198 media.benchmark.vp9.versioncheck: 1 media.gmp-eme-adobe.abi: x86_64-msvc-x64 media.gmp-eme-adobe.lastUpdate: 1456329566 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86_64-msvc-x64 media.gmp-gmpopenh264.enabled: true media.gmp-gmpopenh264.lastUpdate: 1451919922 media.gmp-gmpopenh264.version: 1.5.3 media.gmp-manager.buildID: 20160710030217 media.gmp-manager.lastCheck: 1468332796 media.gmp-widevinecdm.abi: x86_64-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1464807594 media.gmp-widevinecdm.version: 1.4.8.866 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: true network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1468100047 places.favicons.optimizeToDimension: 64 places.history.expiration.transient_current_max_pages: 117160 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.flash: 1 plugin.state.java: 0 plugin.state.npdeployjava: 0 plugin.state.npgoogleupdate: 0 plugin.state.nppdf: 0 plugin.state.npspwrap: 0 plugin.state.npwatweb: 0 plugin.state.npwlpg: 0 print.printer_CutePDF_Writer.print_bgcolor: false print.printer_CutePDF_Writer.print_bgimages: false print.printer_CutePDF_Writer.print_colorspace: print.printer_CutePDF_Writer.print_command: print.printer_CutePDF_Writer.print_downloadfonts: false print.printer_CutePDF_Writer.print_duplex: 6881395 print.printer_CutePDF_Writer.print_edge_bottom: 0 print.printer_CutePDF_Writer.print_edge_left: 0 print.printer_CutePDF_Writer.print_edge_right: 0 print.printer_CutePDF_Writer.print_edge_top: 0 print.printer_CutePDF_Writer.print_evenpages: true print.printer_CutePDF_Writer.print_footercenter: print.printer_CutePDF_Writer.print_footerleft: &PT print.printer_CutePDF_Writer.print_footerright: &D print.printer_CutePDF_Writer.print_headercenter: print.printer_CutePDF_Writer.print_headerleft: &T print.printer_CutePDF_Writer.print_headerright: &U print.printer_CutePDF_Writer.print_in_color: true print.printer_CutePDF_Writer.print_margin_bottom: 0.5 print.printer_CutePDF_Writer.print_margin_left: 0.5 print.printer_CutePDF_Writer.print_margin_right: 0.5 print.printer_CutePDF_Writer.print_margin_top: 0.945138931274414 print.printer_CutePDF_Writer.print_oddpages: true print.printer_CutePDF_Writer.print_orientation: 0 print.printer_CutePDF_Writer.print_page_delay: 50 print.printer_CutePDF_Writer.print_paper_data: 1 print.printer_CutePDF_Writer.print_paper_height: 11.00 print.printer_CutePDF_Writer.print_paper_name: print.printer_CutePDF_Writer.print_paper_size_type: 0 print.printer_CutePDF_Writer.print_paper_size_unit: 0 print.printer_CutePDF_Writer.print_paper_width: 8.50 print.printer_CutePDF_Writer.print_plex_name: print.printer_CutePDF_Writer.print_resolution: 6881398 print.printer_CutePDF_Writer.print_resolution_name: print.printer_CutePDF_Writer.print_reversed: false print.printer_CutePDF_Writer.print_scaling: 0.30 print.printer_CutePDF_Writer.print_shrink_to_fit: false print.printer_CutePDF_Writer.print_to_file: false print.printer_CutePDF_Writer.print_unwriteable_margin_bottom: 0 print.printer_CutePDF_Writer.print_unwriteable_margin_left: 0 print.printer_CutePDF_Writer.print_unwriteable_margin_right: 0 print.printer_CutePDF_Writer.print_unwriteable_margin_top: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_bgcolor: false print.printer_Gestetner_MP_C2551_PCL_6.print_bgimages: false print.printer_Gestetner_MP_C2551_PCL_6.print_colorspace: print.printer_Gestetner_MP_C2551_PCL_6.print_command: print.printer_Gestetner_MP_C2551_PCL_6.print_downloadfonts: false print.printer_Gestetner_MP_C2551_PCL_6.print_duplex: 6881395 print.printer_Gestetner_MP_C2551_PCL_6.print_edge_bottom: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_edge_left: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_edge_right: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_edge_top: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_evenpages: true print.printer_Gestetner_MP_C2551_PCL_6.print_footercenter: print.printer_Gestetner_MP_C2551_PCL_6.print_footerleft: &PT print.printer_Gestetner_MP_C2551_PCL_6.print_footerright: &D print.printer_Gestetner_MP_C2551_PCL_6.print_headercenter: print.printer_Gestetner_MP_C2551_PCL_6.print_headerleft: &T print.printer_Gestetner_MP_C2551_PCL_6.print_headerright: &U print.printer_Gestetner_MP_C2551_PCL_6.print_in_color: true print.printer_Gestetner_MP_C2551_PCL_6.print_margin_bottom: 0.5 print.printer_Gestetner_MP_C2551_PCL_6.print_margin_left: 0.5 print.printer_Gestetner_MP_C2551_PCL_6.print_margin_right: 0.5 print.printer_Gestetner_MP_C2551_PCL_6.print_margin_top: 0.945138931274414 print.printer_Gestetner_MP_C2551_PCL_6.print_oddpages: true print.printer_Gestetner_MP_C2551_PCL_6.print_orientation: 1 print.printer_Gestetner_MP_C2551_PCL_6.print_page_delay: 50 print.printer_Gestetner_MP_C2551_PCL_6.print_paper_data: 9 print.printer_Gestetner_MP_C2551_PCL_6.print_paper_height: 11.00 print.printer_Gestetner_MP_C2551_PCL_6.print_paper_name: print.printer_Gestetner_MP_C2551_PCL_6.print_paper_size_type: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_paper_size_unit: 1 print.printer_Gestetner_MP_C2551_PCL_6.print_paper_width: 8.50 print.printer_Gestetner_MP_C2551_PCL_6.print_plex_name: print.printer_Gestetner_MP_C2551_PCL_6.print_resolution: 6881398 print.printer_Gestetner_MP_C2551_PCL_6.print_resolution_name: print.printer_Gestetner_MP_C2551_PCL_6.print_reversed: false print.printer_Gestetner_MP_C2551_PCL_6.print_scaling: 1.50 print.printer_Gestetner_MP_C2551_PCL_6.print_shrink_to_fit: true print.printer_Gestetner_MP_C2551_PCL_6.print_to_file: false print.printer_Gestetner_MP_C2551_PCL_6.print_unwriteable_margin_bottom: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_unwriteable_margin_left: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_unwriteable_margin_right: 0 print.printer_Gestetner_MP_C2551_PCL_6.print_unwriteable_margin_top: 0 print.printer_TOR5-DrClaw.print_bgcolor: false print.printer_TOR5-DrClaw.print_bgimages: false print.printer_TOR5-DrClaw.print_colorspace: print.printer_TOR5-DrClaw.print_command: print.printer_TOR5-DrClaw.print_downloadfonts: false print.printer_TOR5-DrClaw.print_duplex: 6881395 print.printer_TOR5-DrClaw.print_edge_bottom: 0 print.printer_TOR5-DrClaw.print_edge_left: 0 print.printer_TOR5-DrClaw.print_edge_right: 0 print.printer_TOR5-DrClaw.print_edge_top: 0 print.printer_TOR5-DrClaw.print_evenpages: true print.printer_TOR5-DrClaw.print_footercenter: print.printer_TOR5-DrClaw.print_footerleft: &PT print.printer_TOR5-DrClaw.print_footerright: &D print.printer_TOR5-DrClaw.print_headercenter: print.printer_TOR5-DrClaw.print_headerleft: &T print.printer_TOR5-DrClaw.print_headerright: &U print.printer_TOR5-DrClaw.print_in_color: true print.printer_TOR5-DrClaw.print_margin_bottom: 0.5 print.printer_TOR5-DrClaw.print_margin_left: 0.5 print.printer_TOR5-DrClaw.print_margin_right: 0.5 print.printer_TOR5-DrClaw.print_margin_top: 0.945138931274414 print.printer_TOR5-DrClaw.print_oddpages: true print.printer_TOR5-DrClaw.print_orientation: 0 print.printer_TOR5-DrClaw.print_page_delay: 50 print.printer_TOR5-DrClaw.print_paper_data: 9 print.printer_TOR5-DrClaw.print_paper_height: -1.00 print.printer_TOR5-DrClaw.print_paper_name: print.printer_TOR5-DrClaw.print_paper_size_type: 0 print.printer_TOR5-DrClaw.print_paper_size_unit: 1 print.printer_TOR5-DrClaw.print_paper_width: -1.00 print.printer_TOR5-DrClaw.print_plex_name: print.printer_TOR5-DrClaw.print_resolution: 6881398 print.printer_TOR5-DrClaw.print_resolution_name: print.printer_TOR5-DrClaw.print_reversed: false print.printer_TOR5-DrClaw.print_scaling: 1.00 print.printer_TOR5-DrClaw.print_shrink_to_fit: false print.printer_TOR5-DrClaw.print_to_file: false print.printer_TOR5-DrClaw.print_unwriteable_margin_bottom: 0 print.printer_TOR5-DrClaw.print_unwriteable_margin_left: 0 print.printer_TOR5-DrClaw.print_unwriteable_margin_right: 0 print.printer_TOR5-DrClaw.print_unwriteable_margin_top: 0 print.use_simplify_page: true privacy.clearOnShutdown.cookies: false privacy.clearOnShutdown.offlineApps: true privacy.donottrackheader.enabled: true privacy.sanitize.migrateClearSavedPwdsOnExit: true privacy.sanitize.migrateFx3Prefs: true privacy.trackingprotection.enabled: true privacy.trackingprotection.introCount: 20 security.disable_button.openCertManager: false security.sandbox.content.tempDirSuffix: {10aa2415-98ed-4fec-8fdf-78ad1b5c87e5} services.sync.declinedEngines: passwords services.sync.engine.prefs.modified: false services.sync.lastPing: 1468416358 services.sync.lastSync: Wed Jul 13 2016 10:50:15 GMT-0400 (Eastern Standard Time) services.sync.numClients: 3 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1467752735 Important Locked Preferences ---------------------------- Places Database --------------- JavaScript ---------- Incremental GC: true Accessibility ------------- Activated: false Prevent Accessibility: 0 Library Versions ---------------- NSPR Expected minimum version: 4.12 Version in use: 4.12 NSS Expected minimum version: 3.26 Beta Version in use: 3.26 Beta NSSSMIME Expected minimum version: 3.26 Beta Version in use: 3.26 Beta NSSSSL Expected minimum version: 3.26 Beta Version in use: 3.26 Beta NSSUTIL Expected minimum version: 3.26 Version in use: 3.26 Experimental Features ---------------------

Pretty sure this is a dupe of bug 1286008. I expect it to be fixed once bug 1286258 hits the nightly build.

You also have some Reviewboard ghost windows, FWIW.