I am using windows 7, FF 45.5.1, and I think this problem started immediately after FF updated itself.

When I start FF

This is the Thunderbird support forum. Please confirm whether your question is about Firefox or Thunderbird.

sorry, everyplace I wrote FF substitute TB

When I start FF no sign on screen appears

Can you explain in more detail what that means?

Also see https://support.mozilla.org/kb/cannot-receive-messages

Usually when I open TB a screen appears and I have to enter my bellsouth email id and password. After I do that it downloads my email. This process no longer is working. I looked at the link you provided but this problem started right after TB updated itself and I have not changed any configuration stuff in years.

Are you saying you were prompted to set up your account over and over?

If not anymore now, is the account now set up?

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information. Press the Copy text to clipboard button and paste the information into your reply.

I looked at the link you provided but this problem started right after TB updated itself and I have not changed any configuration stuff in years.

Then I'd suggest you look at it again if you find something related to a recent update.

I found the following: All FAQs → AT&T Southeast Forum FAQ → 2.71 Email Info Open navigator How do I configure my email client for Bellsouth email? Important Update! All legacy BellSouth customers have been migrated to the new AT&T/Yahoo platform and should use the Email Configuration Site.

The servers for all legacy BellSouth customers are: Incoming (POP): pop.att.yahoo.com Outgoing (SMTP): smtp.att.yahoo.com (requires authentication) Incoming mail server type: POP3 Incoming/Outgoing User Name: Full AT&T email address, including domain (e.g. yourname@bellsouth.net) Incoming mail port #: 995, secure connection (SSL) checked Outgoing mail port # 465, secure connection (SSL) checked My setting look like the above info.

Troubleshooting info:

 Application Basics

   Name: Thunderbird
   Version: 45.5.1
   User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20161130024037
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, , (rss) Feeds, plain, passwordCleartext

   account4:
     INCOMING: account4, , (pop3) pop.att.yahoo.com:995, SSL, passwordCleartext
     OUTGOING: , smtp.att.yahoo.com:465, SSL, passwordCleartext, true

 Crash Reports

 Extensions
   Lightning, 4.7.5.1, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     accessibility.lastLoadDate: 1480953874
     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     dom.apps.reset-permissions: true
     extensions.lastAppVersion: 45.5.1
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     gfx.blacklist.direct2d: 3
     gfx.direct3d.last_used_feature_level_idx: 1
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 13a62f4d-bc45-4648-9594-9ddffbe5b7a
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1480463647
     places.history.expiration.transient_current_max_pages: 104858
     places.history.expiration.transient_optimal_database_size: 167772160
     plugin.importedState: true
     print.printer_Canon_MF3200_Series.print_bgcolor: false
     print.printer_Canon_MF3200_Series.print_bgimages: false
     print.printer_Canon_MF3200_Series.print_colorspace:
     print.printer_Canon_MF3200_Series.print_command:
     print.printer_Canon_MF3200_Series.print_downloadfonts: false
     print.printer_Canon_MF3200_Series.print_duplex: 1515870810
     print.printer_Canon_MF3200_Series.print_edge_bottom: 0
     print.printer_Canon_MF3200_Series.print_edge_left: 0
     print.printer_Canon_MF3200_Series.print_edge_right: 0
     print.printer_Canon_MF3200_Series.print_edge_top: 0
     print.printer_Canon_MF3200_Series.print_evenpages: true
     print.printer_Canon_MF3200_Series.print_footercenter:
     print.printer_Canon_MF3200_Series.print_footerleft: &PT
     print.printer_Canon_MF3200_Series.print_footerright: &D
     print.printer_Canon_MF3200_Series.print_headercenter:
     print.printer_Canon_MF3200_Series.print_headerleft: &T
     print.printer_Canon_MF3200_Series.print_headerright: &U
     print.printer_Canon_MF3200_Series.print_in_color: true
     print.printer_Canon_MF3200_Series.print_margin_bottom: 0.5
     print.printer_Canon_MF3200_Series.print_margin_left: 0.5
     print.printer_Canon_MF3200_Series.print_margin_right: 0.5
     print.printer_Canon_MF3200_Series.print_margin_top: 0.5
     print.printer_Canon_MF3200_Series.print_oddpages: true
     print.printer_Canon_MF3200_Series.print_orientation: 0
     print.printer_Canon_MF3200_Series.print_page_delay: 50
     print.printer_Canon_MF3200_Series.print_paper_data: 1
     print.printer_Canon_MF3200_Series.print_paper_height: 11.00
     print.printer_Canon_MF3200_Series.print_paper_name:
     print.printer_Canon_MF3200_Series.print_paper_size_type: 0
     print.printer_Canon_MF3200_Series.print_paper_size_unit: 0
     print.printer_Canon_MF3200_Series.print_paper_width: 8.50
     print.printer_Canon_MF3200_Series.print_plex_name:
     print.printer_Canon_MF3200_Series.print_resolution: 1515870810
     print.printer_Canon_MF3200_Series.print_resolution_name:
     print.printer_Canon_MF3200_Series.print_reversed: false
     print.printer_Canon_MF3200_Series.print_scaling: 1.00
     print.printer_Canon_MF3200_Series.print_shrink_to_fit: true
     print.printer_Canon_MF3200_Series.print_to_file: false
     print.printer_Canon_MF3200_Series.print_unwriteable_margin_bottom: 0
     print.printer_Canon_MF3200_Series.print_unwriteable_margin_left: 0
     print.printer_Canon_MF3200_Series.print_unwriteable_margin_right: 0
     print.printer_Canon_MF3200_Series.print_unwriteable_margin_top: 0
     privacy.donottrackheader.enabled: true

 Graphics

     Adapter Description: Intel(R) G45/G43 Express Chipset
     Vendor ID: 0x8086
     Device ID: 0x2e22
     Adapter RAM: Unknown
     Adapter Drivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
     Driver Version: 8.15.10.2302
     Driver Date: 2-11-2011
     Direct2D Enabled: Blocked for your graphics driver version.
     DirectWrite Enabled: false (6.2.9200.21976)
     ClearType Parameters: ClearType parameters not found
     WebGL Renderer: Google Inc. -- ANGLE (Intel(R) G45/G43 Express Chipset Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE 2.1.0.316930d51ea9)
     GPU Accelerated Windows: 0

     AzureCanvasBackend: skia
     AzureSkiaAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: cairo

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.12
     4.12

     NSS
     3.21.3 Basic ECC
     3.21.3 Basic ECC

     NSS Util
     3.21.3
     3.21.3

     NSS SSL
     3.21.3 Basic ECC
     3.21.3 Basic ECC

     NSS S/MIME
     3.21.3 Basic ECC
     3.21.3 Basic ECC

Thanks for your help.

Have you adjusted your server settings before or after you posted here? In other words, what exactly is your problem now?

If you still have a problem, please explain in detail:

• what you're doing
• what happens
• what you expect to happen

I have not adjusted server settings.

What I am doing: Starting thunderbird.

What happens: thunderbird starts but then nothing happens.

What I expect: Thunderbird starts and presents a sign on window. I enter my bellsouth id and password. Then thunderbird should download my new messages.

Did you tell Thunderbird to remember your account password? In that case you won't see a password prompt.

Are there any new messages on the server which are supposed to show up in Thunderbird? You can check by logging in to your account via webmail.

What is your anti-virus software?

Just to confirm, is there any error message?

Is there anything suspicious in the Error Console? Ctrl-Shift-J

Did you tell Thunderbird to remember your account password? In that case you won't see a password prompt.

Are there any new messages on the server which are supposed to show up in Thunderbird? You can check by logging in to your account via webmail.

Yes, there are 28 messages in the inbox

What is your anti-virus software?

Norton internet security

Just to confirm, is there any error message?

No

Is there anything suspicious in the Error Console? Ctrl-Shift-J

First post in this thread shows error console.

I just started TB and it worked. I did not change anything. I am confused, but happy. You can close this thread if you want. If it happens again I will open another thread. Thank you for your help.