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I have to reinstall the Firefox browser when I try to download an add on

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I am using Windows 10 Pro (64-bit) and I have the latest version of Firefox installed (Firefox Quantum 66.0.3 (64-bit). When I try to download or install and add-on, I get the link "only with Firefox - Get Firefox now". When I click on the link it directs me to the "Download Firefox" page. When I click on this link, the Firefox browser program is downloaded and I have to re-install it. This allows me to download and install the add-on, however I lose all my personalized settings and have to reconfigure them. This occurs when I try to add any add-on or extension.

I am using Windows 10 Pro (64-bit) and I have the latest version of Firefox installed (Firefox Quantum 66.0.3 (64-bit). When I try to download or install and add-on, I get the link "only with Firefox - Get Firefox now". When I click on the link it directs me to the "Download Firefox" page. When I click on this link, the Firefox browser program is downloaded and I have to re-install it. This allows me to download and install the add-on, however I lose all my personalized settings and have to reconfigure them. This occurs when I try to add any add-on or extension.

Chosen solution

Problem solved.

Wesley and cor-el, I tried your suggestions and they didn't resolve the issue. However I found a previous thread (https://support.mozilla.org/en-US/questions/1252955) and followed the suggestions which resolved the issue.

I found a user.js file in my profile, which I didn't create. I opened it and it was empty, so I deleted it. I also uninstalled the program that created the accessibility instantiator.

Thank you both for your assistance and suggestions.

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • Firefox 66.0.3
  • User Agent: Mozilla/5.0 (Windows NT 10.0; rv:61.0) Gecko/20100101 Firefox/61.0 anonymized by Abelssoft 1998461859
  • Support URL: https://support.mozilla.org/1/firefox/66.0.3/WINNT/en-US/

Extensions

  • Adblock Plus - free ad blocker 3.5.2 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • Custom Search Engine 1.6 (custom-search-engine@rsins.addons.mozilla.org)
  • Dashlane 6.3.0 (jetpack-extension@dashlane.com)
  • Default Bookmark Folder 2.8.0 (default-bookmark-folder@gustiaux.com)
  • Ecosia search engine adder 1.1 ({e0a2b045-4668-46ac-ac5e-01208549375f})
  • IObit Surfing Protection & Ads Removal 2.2.0 (ascsurfingprotectionnew@iobit.com)
  • Kaspersky Protection 20.0.543.1053d-20190328170615 (light_plugin_F88CEF8523DE460F9FA1D6E48BF8D340@kaspersky.com)
  • Startpage.com — Private Search Engine 1.1.3 ({20fc2e06-e3e4-4b2b-812b-ab431220cada})
  • Yahoo Search 1.0.0 (@yset)

Javascript

  • incrementalGCEnabled: True

Graphics

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  • driverDate: 4-9-2019
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  • webgl2Extensions: EXT_color_buffer_float 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: Google Inc. -- ANGLE (NVIDIA GeForce GTX 1080 Direct3D11 vs_5_0 ps_5_0)
  • webgl2Version: OpenGL ES 3.0 (ANGLE 2.1.0.eff6bfdb1db9)
  • webgl2WSIInfo: EGL_VENDOR: Google Inc. (adapter LUID: 0000000000014b0b) EGL_VERSION: 1.4 (ANGLE 2.1.0.eff6bfdb1db9) 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_MOZ_create_context_provoking_vertex_dont_care 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
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Modified Preferences

Misc

  • User JS: Yes
  • Accessibility: Yes
Wesley Branton
  • Top 10 Contributor
555 solutions 4791 answers

Helpful Reply

I can't say I've ever heard of this happening. When you downloaded Firefox originally, did you get it from the official Mozilla website?

I also assume this happens when trying to download any add-on from the Firefox Addon website?

First, I'd recommend trying to download an add-on while running in Firefox Safe Mode. This would rule out any issues caused by add-ons that may be interfering with the user agent (the information that tells websites what browser you are using).

If that doesn't help, the problem could be caused by a user.js file that you have in your Firefox profile. This is usually added by other programs or add-ons, but can sometimes cause issues with Firefox. Open your Firefox profile folder and rename the user.js file to user.js.old and then restart Firefox.

Hope this helps.

I can't say I've ever heard of this happening. When you downloaded Firefox originally, did you get it from the official Mozilla website? I also assume this happens when trying to download any add-on from the Firefox Addon website? First, I'd recommend trying to download an add-on while running in [[Troubleshoot Firefox issues using Safe Mode|Firefox Safe Mode]]. This would rule out any issues caused by add-ons that may be interfering with the user agent (the information that tells websites what browser you are using). If that doesn't help, the problem could be caused by a <code>user.js</code> file that you have in your Firefox profile. This is usually added by other programs or add-ons, but can sometimes cause issues with Firefox. Open your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox profile folder]] and rename the <code>user.js</code> file to <code>user.js.old</code> and then restart Firefox. Hope this helps.
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cor-el
  • Top 10 Contributor
  • Moderator
17276 solutions 156148 answers

Helpful Reply

There are other things that need attention.

I notice that your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts. The user.js file will only be present if you or other software has created this file and normally won't be present.

You can check its content with a text editor (right-click: "Open with"; do not double-click). The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.

You can delete the user.js file if you didn't create this file yourself.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:preferences page.

There is also an accessibility instantiator active:

There are other things that need attention. I notice that your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts. The user.js file will only be present if you or other software has created this file and normally won't be present. You can check its content with a text editor (right-click: "Open with"; do not double-click). The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session. You can delete the user.js file if you didn't create this file yourself. You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the <b>about:preferences</b> page. *Help -> Troubleshooting Information -> Profile Directory:<br>Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder *http://kb.mozillazine.org/Profile_folder_-_Firefox There is also an accessibility instantiator active: * "UNKNOWN|C:\\Program Files (x86)\\Unchecky\\bin\\unchecky_bg.exe *https://support.mozilla.org/en-US/kb/accessibility-services
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Chosen Solution

Problem solved.

Wesley and cor-el, I tried your suggestions and they didn't resolve the issue. However I found a previous thread (https://support.mozilla.org/en-US/questions/1252955) and followed the suggestions which resolved the issue.

I found a user.js file in my profile, which I didn't create. I opened it and it was empty, so I deleted it. I also uninstalled the program that created the accessibility instantiator.

Thank you both for your assistance and suggestions.

Problem solved. Wesley and cor-el, I tried your suggestions and they didn't resolve the issue. However I found a previous thread (https://support.mozilla.org/en-US/questions/1252955) and followed the suggestions which resolved the issue. I found a user.js file in my profile, which I didn't create. I opened it and it was empty, so I deleted it. I also uninstalled the program that created the accessibility instantiator. Thank you both for your assistance and suggestions.
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cor-el
  • Top 10 Contributor
  • Moderator
17276 solutions 156148 answers

Yes, you appear to have a weird user agent modified by Abelssoft software with Firefox 61.

  • Mozilla/5.0 (Windows NT 10.0; rv:61.0) Gecko/20100101 Firefox/61.0 anonymized by Abelssoft 1998461859
Yes, you appear to have a weird user agent modified by Abelssoft software with Firefox 61. *Mozilla/5.0 (Windows NT 10.0; rv:61.0) Gecko/20100101 Firefox/61.0 anonymized by Abelssoft 1998461859
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