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I always get the "You have chosen to open..." window

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First, I'm on a mac running macOS Mojave 10.14.5 and Firefox Quantum 67.0.2. From what I gathered, there is an everlasting bug in Firefox that makes it always open a prompt "Opening xxx.xxx" window with various files. OK, but here's my problem: the "Do this automatically for files like this from now on." option is greyed out and I can't select it. If I go in Firefox Preferences/General/Applications, I do have pdf listed and a few others but no way to add another file type and corresponding action (for example add .dmg and select always downlad). I followed Firefox help and deleted handlers.json from my profile foler but that did nothing. So, maybe it's a bug, maybe I missed a setting... in any case this is the only place I found to write this and I hope there's a solution.

First, I'm on a mac running macOS Mojave 10.14.5 and Firefox Quantum 67.0.2. From what I gathered, there is an everlasting bug in Firefox that makes it always open a prompt "Opening xxx.xxx" window with various files. OK, but here's my problem: the "Do this automatically for files like this from now on." option is greyed out and I can't select it. If I go in Firefox Preferences/General/Applications, I do have pdf listed and a few others but no way to add another file type and corresponding action (for example add .dmg and select always downlad). I followed Firefox help and deleted handlers.json from my profile foler but that did nothing. So, maybe it's a bug, maybe I missed a setting... in any case this is the only place I found to write this and I hope there's a solution.
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Additional System Details

Installed Plug-ins

Only default plugins: OpenH264 Video Codec by Cisco and Widevine Contentent Decryption Module by Google.

Application

  • Firefox 67.0.2
  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0
  • Support URL: https://support.mozilla.org/1/firefox/67.0.2/Darwin/en-GB/

Extensions

  • Downie 1.2 (downie@charliemonroe.net)
  • Download Star 2.0.2 ({8cc0b007-e40b-46e8-9e50-e3bf021c94ab})
  • Firefox DevTools ADB Extension 0.0.5 (adb@mozilla.org)
  • Firefox Multi-Account Containers 6.1.0 (@testpilot-containers)
  • NoScript 10.6.3 ({73a6fe31-595d-460b-a920-fcc0f8843232})
  • Privacy Badger 2019.2.19 (jid1-MnnxcxisBPnSXQ@jetpack)
  • uBlock Origin 1.20.0 (uBlock0@raymondhill.net)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription:
  • adapterDeviceID: 0x162b
  • adapterDrivers:
  • adapterRAM:
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  • crashGuards: []
  • driverDate:
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  • lowEndMachine: False
  • numAcceleratedWindows: 2
  • numTotalWindows: 2
  • offMainThreadPaintEnabled: True
  • offMainThreadPaintWorkerCount: 3
  • targetFrameRate: 60
  • 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_shader_fp64 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_attrib_64bit GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic 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_disjoint_timer_query EXT_float_blend EXT_frag_depth EXT_shader_texture_lod EXT_sRGB EXT_texture_compression_rgtc 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
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  • webgl1Version: 4.1 INTEL-12.9.22
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  • 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_shader_fp64 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_attrib_64bit GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic 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_disjoint_timer_query EXT_float_blend EXT_texture_compression_rgtc 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: Intel Inc. -- Intel(R) Iris(TM) Graphics 6100
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  • webgl2WSIInfo: CGL
  • windowLayerManagerRemote: True
  • windowLayerManagerType: OpenGL
  • windowUsingAdvancedLayers: False

Modified Preferences

Misc

  • User JS: No
  • Accessibility: No
jscher2000
  • Top 10 Contributor
8568 solutions 70054 answers

The box is always grayed everywhere for any kind of download? Hmm, do you have Firefox set to never save history, or in other words, to use automatic private browsing? Just wondering if that could be related.


If you noticed this problem on a particular website, rather than everywhere, I would suggest:

Some websites do not send the PDF-specific Content-Type header (application/pdf) and then Firefox doesn't treat them like PDFs but instead like a generic kind of binary file. I created an add-on to work around that issue (when a file has a .pdf extension, it corrects the content-type):

https://addons.mozilla.org/firefox/addon/content-type-fixer/

I suggest keeping it turned off, and turning it on when you get to a site with that problem.

The box is always grayed everywhere for any kind of download? Hmm, do you have Firefox set to never save history, or in other words, to use automatic private browsing? Just wondering if that could be related. ---- If you noticed this problem on a particular website, rather than everywhere, I would suggest: Some websites do not send the PDF-specific Content-Type header (application/pdf) and then Firefox doesn't treat them like PDFs but instead like a generic kind of binary file. I created an add-on to work around that issue (when a file has a .pdf extension, it corrects the content-type): https://addons.mozilla.org/firefox/addon/content-type-fixer/ I suggest keeping it turned off, and turning it on when you get to a site with that problem.
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cor-el
  • Top 10 Contributor
  • Moderator
17334 solutions 156717 answers

You can also try to use the Web Console on Network Monitor to check requests and response headers for these files.

You can also try to use the Web Console on Network Monitor to check requests and response headers for these files. *https://developer.mozilla.org/en-US/Tools/Web_Console *https://developer.mozilla.org/en-US/Tools/Network_Monitor
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