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why does fierfox eats so much cpu when i'm on youtube?

  • 5 replies
  • 1 has this problem
  • Last reply by guigs

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i have Pentium d 925 3ghz dual core, GeForce 210, Windows 10 Pro, and a good internet connection. Recently i started to lag really hard on youtube videos, playing at 720. I always watched videos in 720pp, on windows xp, vista, 7 ultimate, and even after the upgrade, i didn't had any lag. Now i lag like hell, after the first 3 seconds the cpu goes insane, firefox is consuming 95% of cpu power. I had to downgrade to firefox 39 and install html5 disablers just to watch a video... here is some info about my firefox: Application Basics

Name: Firefox Version: 39.0 Build ID: 20150630154324 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; rv:39.0) Gecko/20100101 Firefox/39.0 Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days

All Crash Reports


Name: Adblock Plus Version: 2.7.3 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: YouTube High Definition Version: 45.1 Enabled: true ID: {7b1bf0b6-a1b9-42b0-b75d-252036438bdc}

Name: YouTube™ Flash® Player Version: 1.6.2 Enabled: true ID: jid1-HAV2inXAnQPIeA@jetpack


Adapter Description: NVIDIA GeForce 210 Adapter Drivers: nvd3dum nvwgf2um,nvwgf2um Adapter RAM: 1024 Asynchronous Pan/Zoom: none Device ID: 0x0a65 Direct2D Enabled: true DirectWrite Enabled: true (10.0.10586.0) Driver Date: 1-29-2016 Driver Version: GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 140110b0 Vendor ID: 0x10de windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 4 true browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20150630154324 browser.startup.homepage_override.buildID: 20150630154324 browser.startup.homepage_override.mstone: 39.0 browser.urlbar.suggest.searches: true browser.urlbar.userMadeSearchSuggestionsChoice: true dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 39.0 font.internaluseonly.changed: false gfx.crash-guard.d3d11layers.appVersion: 46.0 gfx.crash-guard.d3d11layers.deviceID: 0x0a65 gfx.crash-guard.d3d11layers.driverVersion: gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d9video: 2 gfx.direct3d.last_used_feature_level_idx: 0 media.encoder.webm.enabled: false media.gmp-eme-adobe.abi: x86-msvc-x86 media.gmp-eme-adobe.lastUpdate: 1461965695 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86-msvc-x86 media.gmp-gmpopenh264.enabled: true media.gmp-gmpopenh264.lastUpdate: 1461954340 media.gmp-gmpopenh264.version: 1.5.3 media.gmp-manager.buildID: 20150630154324 media.gmp-manager.lastCheck: 1461967495 media.hardware-video-decoding.failed: false media.webrtc.debug.aec_log_dir: C:\Users\Andrei\AppData\Local\Temp/ media.webrtc.debug.log_file: C:\Users\Andrei\AppData\Local\Temp/WebRTC.log network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1461969041 places.history.expiration.transient_current_max_pages: 80516 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true privacy.sanitize.migrateClearSavedPwdsOnExit: true privacy.sanitize.migrateFx3Prefs: true storage.vacuum.last.index: 0 storage.vacuum.last.places.sqlite: 1461969040 webgl.disabled: true

Important Locked Preferences


Incremental GC: true


Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.8 Version in use: 4.10.8

NSS Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSSMIME Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSSSL Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSUTIL Expected minimum version: 3.19.2 Version in use: 3.19.2

Experimental Features

Please, please help me i'm going insane with this problem..i've reseted the windows twice, i don't have viruses i don't have hardware problems i just started to lag for some reason... Thank you.

Chosen solution

Ok, so, i upgraded to the last version again. And it seems it works fine for now.

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All Replies (5)

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BTW, i have hardware acceleration activated.

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The problem is still here, and this is a fresh install of firefox and windows, i don't think it will work

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Chosen Solution

Ok, so, i upgraded to the last version again. And it seems it works fine for now.

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Does toggling addons while watching youtube videos make a difference? For example, Adblocker?

Try Safe Mode to try it out: Diagnose Firefox issues using Troubleshoot Mode