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why is a previously available website no longer available

Kuphostiwe

I've been using the website duolingo for month and have always accessed it by a Firebox bookmark. For some odd reason, when trying to access it today, the web url appeared in the browser menu bar, yet the page did not open. I tried to access the site using Safari and the site opened. My browser of preference is Firefox. What should I do to resolve this mystery of inaccessibility? To the best of my knowledge I did not make any preference settings changes in Firefox and I even tried resetting Firefox which also did not work.

I've been using the website duolingo for month and have always accessed it by a Firebox bookmark. For some odd reason, when trying to access it today, the web url appeared in the browser menu bar, yet the page did not open. I tried to access the site using Safari and the site opened. My browser of preference is Firefox. What should I do to resolve this mystery of inaccessibility? To the best of my knowledge I did not make any preference settings changes in Firefox and I even tried resetting Firefox which also did not work.

Isisombululo esikhethiwe

In another thread, the user reported that Norton Safe Web is causing the issue:

https://support.mozilla.org/questions/1252910#answer-1204613

Funda le mpendulo ngokuhambisana nalesi sihloko 1

Eminye Imininingwane Yohlelo

Fakela amapulagi

  • Shockwave Flash 32.0 r0

Isisebenziso

  • Firefox 65.0.1
  • Umsebenzisi oyi-ejenti: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:65.0) Gecko/20100101 Firefox/65.0
  • I-URL Yokweseka: https://support.mozilla.org/1/firefox/65.0.1/Darwin/en-US/

Izandiso

  • DuckDuckGo Privacy Essentials 2019.1.31 (jid1-ZAdIEUB7XOzOJw@jetpack)
  • Norton Safe Web 3.6.0.10 (nortonsafeweb@symantec.com)
  • Data Selfie 0.1.2 ({87dfccf4-b6eb-4297-948a-ac6fd273cbb5}) (Akusebenzi)

I-Javascript

  • incrementalGCEnabled: True

Imidwebo

  • adapterDescription:
  • adapterDeviceID: 0x6720
  • adapterDrivers:
  • adapterRAM:
  • adapterVendorID: 0x1002
  • contentUsesTiling: True
  • crashGuards: []
  • driverDate:
  • driverVersion:
  • 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'OpenGL Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'OPENGL_COMPOSITING'}, {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', u'description': u'WebRender qualified', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blocked', u'message': u'No qualified hardware', 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'}]}
  • info: {u'TileHeight': 1024, u'ApzWheelInput': 1, u'ApzDragInput': 1, u'ApzKeyboardInput': 1, u'ApzAutoscrollInput': 1, u'AzureFallbackCanvasBackend': u'none', u'TileWidth': 1024, u'AzureCanvasAccelerated': 0, u'AzureCanvasBackend': u'skia', u'AzureContentBackend': u'skia'}
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • offMainThreadPaintEnabled: True
  • offMainThreadPaintWorkerCount: 4
  • usesTiling: True
  • webgl1DriverExtensions: GL_ARB_blend_func_extended GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_ES2_compatibility GL_ARB_explicit_attrib_location GL_ARB_gpu_shader5 GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_occlusion_query2 GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_shading_language_include GL_ARB_tessellation_shader GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_swizzle GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_mirror_clamp GL_EXT_texture_sRGB_decode GL_APPLE_client_storage GL_APPLE_container_object_shareable GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_texture_range GL_ATI_texture_mirror_once GL_NV_texture_barrier
  • webgl1Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_texture_compression_rgtc EXT_frag_depth EXT_sRGB EXT_shader_texture_lod EXT_texture_filter_anisotropic EXT_disjoint_timer_query 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: ATI Technologies Inc. -- AMD Radeon HD 6970M OpenGL Engine
  • webgl1Version: 4.1 ATI-1.68.21
  • webgl1WSIInfo: CGL
  • webgl2DriverExtensions: GL_ARB_blend_func_extended GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_ES2_compatibility GL_ARB_explicit_attrib_location GL_ARB_gpu_shader5 GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_occlusion_query2 GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_shading_language_include GL_ARB_tessellation_shader GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_swizzle GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_mirror_clamp GL_EXT_texture_sRGB_decode GL_APPLE_client_storage GL_APPLE_container_object_shareable GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_texture_range GL_ATI_texture_mirror_once GL_NV_texture_barrier
  • webgl2Extensions: EXT_color_buffer_float EXT_texture_compression_rgtc EXT_texture_filter_anisotropic EXT_disjoint_timer_query OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context
  • webgl2Renderer: ATI Technologies Inc. -- AMD Radeon HD 6970M OpenGL Engine
  • webgl2Version: 4.1 ATI-1.68.21
  • webgl2WSIInfo: CGL
  • windowLayerManagerRemote: True
  • windowLayerManagerType: OpenGL
  • windowUsingAdvancedLayers: False

Okuthandwayo Okulungisiwe

Misc

  • Umsebenzisi JS: Cha
  • Ukufinyeleleka: Cha
jscher2000
  • Top 10 Contributor
8773 izisombululo 71728 izimpendulo
Kuphostiwe

Hi HalfABubble, are you going to the home page --

https://www.duolingo.com/

-- or a specific page within the site?

Does the home page load for you?

I notice the site uses a CloudFront server for some of its content. For example, this is the first style sheet address when I load the home page:

https://d35aaqx5ub95lt.cloudfront.net/css/ltr-e3cf191c.css

Can you check to make sure that server isn't being blocked by Firefox's Content Blocking feature or any of your add-ons:

Double-check content blockers: Firefox's Content Blocking feature and extensions that counter ads and tracking may break websites that embed third party content (meaning, from a secondary server).

(A) Do you see a shield icon toward the left end of the address bar, near the lock icon? More info on managing the Tracking Protection feature in this article: Content blocking.

(B) Extensions such as Adblock Plus, Blur, Disconnect, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix should provide toolbar buttons to manage blocked content in a page. There may or may not be a number on the icon indicating the number of blocked items; you may need to click the button to see what's going on and test whether you need to make an exception for this site.

Hi HalfABubble, are you going to the home page -- https://www.duolingo.com/ -- or a specific page within the site? Does the home page load for you? I notice the site uses a CloudFront server for some of its content. For example, this is the first style sheet address when I load the home page: https://d35aaqx5ub95lt.cloudfront.net/css/ltr-e3cf191c.css Can you check to make sure that server isn't being blocked by Firefox's Content Blocking feature or any of your add-ons: '''Double-check content blockers:''' Firefox's Content Blocking feature and extensions that counter ads and tracking may break websites that embed third party content (meaning, from a secondary server). (A) Do you see a shield icon toward the left end of the address bar, near the lock icon? More info on managing the Tracking Protection feature in this article: [[Content Blocking]]. (B) Extensions such as Adblock Plus, Blur, Disconnect, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix should provide toolbar buttons to manage blocked content in a page. There may or may not be a number on the icon indicating the number of blocked items; you may need to click the button to see what's going on and test whether you need to make an exception for this site.

Umnikazi wombuzo

Hello Jscher2000,

Prompt Reply - Thank You The Home Page does not load There is no shield icon. When viewing the site information:

  Connection = Secure Connection
  Content Blocking = No Blockable content detected on this page
  Permissions = you have not granted granted this site any special permissions

Any other ideas?

Hello Jscher2000, Prompt Reply - Thank You The Home Page does not load There is no shield icon. When viewing the site information: Connection = Secure Connection Content Blocking = No Blockable content detected on this page Permissions = you have not granted granted this site any special permissions Any other ideas?
jscher2000
  • Top 10 Contributor
8773 izisombululo 71728 izimpendulo
Kuphostiwe

If you don't mind getting a little nerdy, could you open the Network Monitor tool in the lower part of the tab, using either:

  • "3-bar" menu button > Web Developer > Network
  • (menu bar) Tools > Web Developer > Network
  • (Windows) Ctrl+Shift+e

Then reload the page in the top part of the tab (Ctrl+r or use the reload button). Firefox should start listing all the files it is requesting, along with information about whether the request was successful.

  • 200 = successful fresh or cached retrieval
  • 301 or 302 = redirect to different URL
  • 304 = server confirmation to use cached file

Do you see a lot of failed requests?

If you don't mind getting a little nerdy, could you open the Network Monitor tool in the lower part of the tab, using either: * "3-bar" menu button > Web Developer > Network * (menu bar) Tools > Web Developer > Network * (Windows) Ctrl+Shift+e Then reload the page in the top part of the tab (Ctrl+r or use the reload button). Firefox should start listing all the files it is requesting, along with information about whether the request was successful. * 200 = successful fresh or cached retrieval * 301 or 302 = redirect to different URL * 304 = server confirmation to use cached file Do you see a lot of failed requests?

Umnikazi wombuzo

the 'little nerdy' reply - have sent you email (carrferrell) with a screen print of the information displayed using the Network Monitor tool, with a yield of: 200, 304, 304, 304, 304, 200 & 200

Subject Line : Screen Print Result of Network Monitor - duolingo page refresh

the 'little nerdy' reply - have sent you email (carrferrell) with a screen print of the information displayed using the Network Monitor tool, with a yield of: 200, 304, 304, 304, 304, 200 & 200 Subject Line : Screen Print Result of Network Monitor - duolingo page refresh
jscher2000
  • Top 10 Contributor
8773 izisombululo 71728 izimpendulo
Kuphostiwe

The scripts that show a size of zero bytes should definitely not be so small (comparison screenshots attached). Do you use any security software or add-ons that could be filtering out the contents of those scripts?

The scripts that show a size of zero bytes should definitely not be so small (comparison screenshots attached). Do you use any security software or add-ons that could be filtering out the contents of those scripts?
jscher2000
  • Top 10 Contributor
8773 izisombululo 71728 izimpendulo
Kuphostiwe

Isisombululo Esikhethiwe

In another thread, the user reported that Norton Safe Web is causing the issue:

https://support.mozilla.org/questions/1252910#answer-1204613

In another thread, the user reported that Norton Safe Web is causing the issue: https://support.mozilla.org/questions/1252910#answer-1204613

Umnikazi wombuzo

Spot On - Thank you - I too will send a note to Duolingo.

Spot On - Thank you - I too will send a note to Duolingo.