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Why does Firefox use so much memory ?

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I have 721 tabs open and Firefox uses about 2 GB of memory. Why doesn't Firefox simply memorize only the URLs rather than the whole pages ? Firefox becomes sluggish. The whole PC seems to be impacted ...

I have 721 tabs open and Firefox uses about 2 GB of memory. Why doesn't Firefox simply memorize only the URLs rather than the whole pages ? Firefox becomes sluggish. The whole PC seems to be impacted ...
Quote

Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • Firefox 68.0.2
  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0
  • Support URL: https://support.mozilla.org/1/firefox/68.0.2/WINNT/en-US/

Extensions

  • Amazon.com 1.1 (amazondotcom@search.mozilla.org)
  • Bing 1.0 (bing@search.mozilla.org)
  • Cisco Webex Extension 1.5.0 (ciscowebexstart1@cisco.com)
  • DuckDuckGo 1.0 (ddg@search.mozilla.org)
  • eBay 1.0 (ebay@search.mozilla.org)
  • Enhancer for YouTube™ 2.0.98.2 (enhancerforyoutube@maximerf.addons.mozilla.org)
  • Facebook Container 2.0.2 (@contain-facebook)
  • FoxyTab 2.15 (foxytab@eros.man)
  • Google 1.0 (google@search.mozilla.org)
  • NoScript 11.0.3 ({73a6fe31-595d-460b-a920-fcc0f8843232})
  • Tab Session Manager 5.0.0 (Tab-Session-Manager@sienori)
  • Twitter 1.0 (twitter@search.mozilla.org)
  • Wikipedia (en) 1.0 (wikipedia@search.mozilla.org)
  • Duplicate Tabs Closer 3.4.1 (jid0-RvYT2rGWfM8q5yWxIxAHYAeo5Qg@jetpack) (Inactive)
  • iCloud Bookmarks 2.1.23 (firefoxdav@icloud.com) (Inactive)
  • Session Boss 2.11.2 (sessionboss@william.wong) (Inactive)
  • Tab Mix - Links 0.1.0 (webext@tabmixplus.org) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: Intel(R) HD Graphics 5500
  • adapterDescription2:
  • adapterDeviceID: 0x1616
  • adapterDeviceID2:
  • adapterDrivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32
  • adapterDrivers2:
  • adapterRAM: Unknown
  • adapterRAM2:
  • adapterSubsysID: 503617aa
  • adapterSubsysID2:
  • adapterVendorID: 0x8086
  • adapterVendorID2:
  • clearTypeParameters: Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
  • contentUsesTiling: False
  • crashGuards: [{u'prefName': u'gfx.crash-guard.status.wmfvpxvideo', u'type': u'wmfvpxvideo'}]
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 10.0.18362.10013
  • driverDate: 8-16-2018
  • driverDate2:
  • driverVendor:
  • driverVendor2:
  • driverVersion: 20.19.15.5058
  • driverVersion2:
  • failures: [u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.', u'CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.']
  • featureLog: {u'fallbacks': [], u'features': [{u'status': u'available', u'description': u'Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'HW_COMPOSITING'}, {u'status': u'available', u'description': u'Direct3D11 Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'D3D11_COMPOSITING'}, {u'status': u'available', u'description': u'Direct2D', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'DIRECT2D'}, {u'status': u'available', u'description': u'Direct3D11 hardware ANGLE', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'D3D11_HW_ANGLE'}, {u'status': u'available', u'description': u'GPU Process', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'GPU_PROCESS'}, {u'status': u'opt-in', u'description': u'WebRender', u'log': [{u'status': u'opt-in', u'message': u'WebRender is an opt-in feature', u'type': u'default'}], u'name': u'WEBRENDER'}, {u'status': u'blocked-has-battery', u'description': u'WebRender qualified', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blocked-has-battery', u'message': u'Has battery', u'type': u'env'}], u'name': u'WEBRENDER_QUALIFIED'}, {u'status': u'available', u'description': u'Off Main Thread Painting', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'OMTP'}, {u'status': u'available', u'description': u'Advanced Layers', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'ADVANCED_LAYERS'}]}
  • indices: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
  • info: {u'AzureContentBackend (UI Process)': u'skia', u'AzureCanvasBackend (UI Process)': u'skia', u'ApzWheelInput': 1, u'ApzDragInput': 1, u'ApzKeyboardInput': 1, u'ApzTouchInput': 1, u'AzureFallbackCanvasBackend (UI Process)': u'cairo', u'ApzAutoscrollInput': 1, u'AzureCanvasBackend': u'direct2d 1.1', u'AzureContentBackend': u'direct2d 1.1'}
  • isGPU2Active: False
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • offMainThreadPaintEnabled: True
  • offMainThreadPaintWorkerCount: 3
  • targetFrameRate: 60
  • usesTiling: False
  • webgl1DriverExtensions: GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
  • webgl1Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_disjoint_timer_query EXT_float_blend EXT_frag_depth EXT_shader_texture_lod EXT_sRGB EXT_texture_compression_bptc EXT_texture_filter_anisotropic OES_element_index_uint OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context
  • webgl1Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 5500 Direct3D11 vs_5_0 ps_5_0)
  • webgl1Version: OpenGL ES 2.0 (ANGLE 2.1.0.8a050090f926)
  • webgl1WSIInfo: EGL_VENDOR: Google Inc. (adapter LUID: 00000000000155ac) EGL_VERSION: 1.4 (ANGLE 2.1.0.8a050090f926) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled EGL_ANDROID_blob_cache EGL_ANDROID_recordable EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug EGL_ANGLE_explicit_context
  • webgl2DriverExtensions: GL_ANGLE_client_arrays GL_ANGLE_copy_texture_3d GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_multisample GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object GL_OVR_multiview2 OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
  • webgl2Extensions: EXT_color_buffer_float EXT_disjoint_timer_query EXT_float_blend EXT_texture_compression_bptc EXT_texture_filter_anisotropic OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context
  • webgl2Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 5500 Direct3D11 vs_5_0 ps_5_0)
  • webgl2Version: OpenGL ES 3.0 (ANGLE 2.1.0.8a050090f926)
  • webgl2WSIInfo: EGL_VENDOR: Google Inc. (adapter LUID: 00000000000155ac) EGL_VERSION: 1.4 (ANGLE 2.1.0.8a050090f926) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled EGL_ANDROID_blob_cache EGL_ANDROID_recordable EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug EGL_ANGLE_explicit_context
  • windowLayerManagerRemote: True
  • windowLayerManagerType: Direct3D 11
  • windowUsingAdvancedLayers: True

Modified Preferences

Misc

  • User JS: No
  • Accessibility: Yes
My_Cheese_Is_Slippin'
  • Top 10 Contributor
64 solutions 756 answers

Helpful Reply

Hi Toon_, Firefox only uses about 200 MB of memory.

Everything else - extensions, themes, plug-ins, Content Blocking, hardware acceleration, tabs, etc. - are all on the User.

Hi Toon_, Firefox only uses about 200 MB of memory. Everything else - extensions, themes, plug-ins, Content Blocking, hardware acceleration, tabs, etc. - are all on the User.
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Question owner

Hi Slippin' Cheese, How can I find out then which of these components use what amounts of memory ?

Hi Slippin' Cheese, How can I find out then which of these components use what amounts of memory ?
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
64 solutions 756 answers

Firefox has a built-in Task Manager which will tell how much memory is being used by extensions and tabs.

Click Menu -> More -> Task Manager

Firefox has a built-in Task Manager which will tell how much memory is being used by extensions and tabs. Click Menu -> More -> Task Manager
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
64 solutions 756 answers

Also, see this article:

Task Manager - see what tabs or extensions are slowing down Firefox https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox

Also, see this article: Task Manager - see what tabs or extensions are slowing down Firefox https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox
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