hello, could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum?

Application Basics

Name: Firefox Version: 48.0 Build ID: 20160726073904 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 OS: Windows_NT 6.1 x86 Multiprocess Windows: 1/1 (Enabled by default) Safe Mode: false

Crash Reports for the Last 3 Days

All Crash Reports (including 2 pending crashes in the given time range)

Extensions

Name: Firefox Hello Beta Version: 1.4.4 Enabled: true ID: loop@mozilla.org

Name: Multi-process staged rollout Version: 1.1 Enabled: true ID: e10srollout@mozilla.org

Name: Pocket Version: 1.0.4 Enabled: true ID: firefox@getpocket.com

Name: Bing Search Version: 1.0.0.2 Enabled: false ID: bingsearch.full@microsoft.com

Graphics

Features Compositing: Direct3D 11 Asynchronous Pan/Zoom: wheel input enabled WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon HD 7520G Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding: Yes; Using D3D9 API Direct2D: true DirectWrite: true (6.2.9200.17568) GPU #1 Active: Yes Description: AMD Radeon HD 7520G Vendor ID: 0x1002 Device ID: 0x9990 Driver Version: 8.941.1.0 Driver Date: 2-9-2012 Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Subsys ID: 1849103c RAM: 512

Diagnostics AzureCanvasAccelerated: 0 AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo

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.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 1 browser.download.importedFromSqlite: true browser.download.manager.alertOnEXEOpen: true browser.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20160726073904 browser.startup.homepage: about:home browser.startup.homepage_override.buildID: 20160726073904 browser.startup.homepage_override.mstone: 48.0 browser.tabs.remote.autostart.2: true browser.urlbar.daysBeforeHidingSuggestionsPrompt: 0 browser.urlbar.lastSuggestionsPromptDate: 20160809 dom.apps.reset-permissions: true dom.mozApps.used: true dom.push.userAgentID: 2f5c82285a574132bfae9a2942e96ab3 extensions.lastAppVersion: 48.0 font.internaluseonly.changed: false gfx.crash-guard.d3d11layers.appVersion: 48.0 gfx.crash-guard.d3d11layers.deviceID: 0x9990 gfx.crash-guard.d3d11layers.driverVersion: 8.941.1.0 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: 42.0 gfx.driver-init.deviceID: 0x9990 gfx.driver-init.driverVersion: 8.941.1.0 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 keyword.URL: http://www.bing.com/search?FORM=SL5ADF&PC=SL5A&q= media.benchmark.vp9.fps: 72 media.benchmark.vp9.versioncheck: 1 media.gmp-eme-adobe.abi: x86-msvc-x64 media.gmp-eme-adobe.lastUpdate: 1461812617 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1471531296 media.gmp-gmpopenh264.version: 1.6 media.gmp-manager.buildID: 20160726073904 media.gmp-manager.lastCheck: 1471619100 media.gmp-widevinecdm.abi: x86-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1465568899 media.gmp-widevinecdm.version: 1.4.8.866 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: false media.webrtc.debug.aec_log_dir: C:\Users\Brian\AppData\Local\Temp media.webrtc.debug.log_file: C:\Users\Brian\AppData\Local\Temp\WebRTC.log media.youtube-ua.override.to: 43 network.auth.allow-subresource-auth: 2 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1471467080 places.history.expiration.transient_current_max_pages: 93333 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.printer_HP_Deskjet_F4200_series.print_bgcolor: false print.printer_HP_Deskjet_F4200_series.print_bgimages: false print.printer_HP_Deskjet_F4200_series.print_duplex: -437918235 print.printer_HP_Deskjet_F4200_series.print_edge_bottom: 0 print.printer_HP_Deskjet_F4200_series.print_edge_left: 0 print.printer_HP_Deskjet_F4200_series.print_edge_right: 0 print.printer_HP_Deskjet_F4200_series.print_edge_top: 0 print.printer_HP_Deskjet_F4200_series.print_evenpages: true print.printer_HP_Deskjet_F4200_series.print_footercenter: print.printer_HP_Deskjet_F4200_series.print_footerleft: &PT print.printer_HP_Deskjet_F4200_series.print_footerright: &D print.printer_HP_Deskjet_F4200_series.print_headercenter: print.printer_HP_Deskjet_F4200_series.print_headerleft: &T print.printer_HP_Deskjet_F4200_series.print_headerright: &U print.printer_HP_Deskjet_F4200_series.print_in_color: true print.printer_HP_Deskjet_F4200_series.print_margin_bottom: 0.5 print.printer_HP_Deskjet_F4200_series.print_margin_left: 0.5 print.printer_HP_Deskjet_F4200_series.print_margin_right: 0.5 print.printer_HP_Deskjet_F4200_series.print_margin_top: 0.5 print.printer_HP_Deskjet_F4200_series.print_oddpages: true print.printer_HP_Deskjet_F4200_series.print_orientation: 0 print.printer_HP_Deskjet_F4200_series.print_page_delay: 50 print.printer_HP_Deskjet_F4200_series.print_paper_data: 1 print.printer_HP_Deskjet_F4200_series.print_paper_height: -1.00 print.printer_HP_Deskjet_F4200_series.print_paper_name: print.printer_HP_Deskjet_F4200_series.print_paper_size_type: 0 print.printer_HP_Deskjet_F4200_series.print_paper_size_unit: 0 print.printer_HP_Deskjet_F4200_series.print_paper_width: -1.00 print.printer_HP_Deskjet_F4200_series.print_resolution: 600 print.printer_HP_Deskjet_F4200_series.print_reversed: false print.printer_HP_Deskjet_F4200_series.print_scaling: 1.00 print.printer_HP_Deskjet_F4200_series.print_shrink_to_fit: true print.printer_HP_Deskjet_F4200_series.print_to_file: false print.printer_HP_Deskjet_F4200_series.print_unwriteable_margin_bottom: 0 print.printer_HP_Deskjet_F4200_series.print_unwriteable_margin_left: 0 print.printer_HP_Deskjet_F4200_series.print_unwriteable_margin_right: 0 print.printer_HP_Deskjet_F4200_series.print_unwriteable_margin_top: 0 privacy.sanitize.migrateClearSavedPwdsOnExit: true privacy.sanitize.migrateFx3Prefs: true services.sync.declinedEngines: forms,history,passwords,prefs,tabs,addons services.sync.engine.addons: false services.sync.engine.history: false services.sync.engine.passwords: false services.sync.engine.prefs: false services.sync.engine.tabs: false services.sync.lastPing: 1471549766 services.sync.lastSync: Fri Aug 19 2016 15:41:14 GMT-0400 (Eastern Standard Time) services.sync.numClients: 1 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1470234247

Important Locked Preferences

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: 3.24 Basic ECC Version in use: 3.24 Basic ECC

NSSSMIME Expected minimum version: 3.24 Basic ECC Version in use: 3.24 Basic ECC

NSSSSL Expected minimum version: 3.24 Basic ECC Version in use: 3.24 Basic ECC

NSSUTIL Expected minimum version: 3.24 Version in use: 3.24

Experimental Features

hi, so it appears that you are part of the cohort that got the multi-process architecture of the browser enabled: https://blog.mozilla.org/futurereleases/2016/08/02/whats-next-for-multi-process-firefox/ web content will run in a separate process from the ui now, which is happening in the plugin-container.exe (so it is normal that it uses more resources now).

What about the whole tab reloading thing most times I switch between tabs? I check my work email in Tab A. Check my personal email in Tab B. Go back to Tab A to follow up, and have to wait 30 seconds to a minute for the tab to reset. How is this a good thing? Can I get it back to the way it was before?

Do you want to try turning it off?

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste tabs.r and pause while the list is filtered

(3) Double-click the browser.tabs.remote.autostart preference to switch the value from true to false

Does that work, or does it stay stuck on true? I don't think it actually would take effect until the next time you start Firefox.

Alacrity said

What about the whole tab reloading thing most times I switch between tabs? I check my work email in Tab A. Check my personal email in Tab B. Go back to Tab A to follow up, and have to wait 30 seconds to a minute for the tab to reset. How is this a good thing? Can I get it back to the way it was before?

thanks for following up. this is certainly no intended behaviour but sounds more like a bug to me, so i've filed bug 1297496 about the issue, so you might want to follow along there as well. could you also tell us what mail providers you were using while switching between tabs when they got stuck? thanks for your patience & i hope we can fix the issue together...