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  • TB 115 was released on Tuesday July 11, 2023
  • TB 102.15 -> 115.2.1 auto updates turned on Wed Sep 6, 2023 at 5%, turned off 5 days later because of some issues
  • TB 115.2.3 released around noon Pacific September 20, 2023 with fixes for bug 1847401: "unified folders does not show subfolders of IMAP Inbox and other folders anywhere. And other manifestations" and blank folder bugs like: bug 1852814, bug 1853824, bug 1853961 and moar
  • for bug 1814823:"Saved scopes or other login info breaks Microsoft OAuth" <-- fixed in 118b5, may be uplifted to a future 115 build

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Thunderbird 115.0 issues

tl;dr: No major issues found in SUMO. As expected, unsupported customizations from 102 broke in 115 and the new user interface in particular the Unified Toolbar led to a few issues for some. Carryover issues from 102 and earlier releases.such as MS OAuth, Exchange, etc continued.

Fixed in 115.0.x

Not so minor

(not in order)

  • bug 1847658: "calendar invitation not send to attendees (but is sent to organizer)" <-- not fixed in 115.2.3
  • Blank Folder Pane issue could be one or more of:
    • bug 1853961: "Since upgrading to 115.2 from 102.15, cannot see IMAP mail folders or mail" <-- fixed in 115.2.3
    • bug 1852814: "Since upgrading to 115, all imap emails disappear on each startup" <- fixed in 115.2.3
    • bug 1853824: "Catch errors from broken folders when filling the folder tree" <-- fixed in 115.2.3
  • Blank Folder Pane issue (see bug 1847401: "unified folders does not show subfolders of IMAP Inbox and other folders anywhere. And other manifestations" and ) : Thunderbird 115 blank folder issue browser console screendump; Workaround which allows Thunderbird to display folders but doesn't solve the problem for the offending folder: drag offending folder e.g. "safe harbour_" in the example below to the desktop out of the Thunderbird Folder using Windows Explorer or macOS Finder or whatever it's called in Linux :-) !) key things:
    • 1. NS_ERROR_FILE_NAME_TOO_LONG 0x80520011 nsIMsgFolder.subfolders
    • 2. gloda.index_msg Problem entering folder xxxx (in this case folder name is "safe harbour_".) undefined:629 0x80070057 illegal value nsIMsgLocalMailFolder.getDatabaseWithReparse

You can see 1. and 2. in in this full screen screenshot, and here's a thumbnail:

2023-09-18: Thumbnail of 800px wide version of Thunderbird 115 browser console error message from blank folder issue
  • bug 1847401: unified folders does not show IMAP Inbox subfolders anywhere --> geoff: "If subfolders of your inbox were included in the search, they would be displayed in the unified section of the folder tree, as subfolders of the inbox. If they're not included in the search, they should be shown below (but they're not, which is what I've attempted to fix)." <-- trying for a fix in 115.2.3 (Subfolders were not included in the search by default until 115, but you can now choose whether or not they're included in the search by opening the properties of the unified inbox.)"
  • bug 1851871: Message header display delayed by images that are slow to load and bug 1840943: Message headers missing or slow to load in message preview for some messages (rarely, and random). Displays in message list. <-- trying for a fix for both these bugs in 115.2.3
  • 1843637 v115 fails to subscribe Imap subfolders at folder hierarchy-depth > 2; v <=102 works OK filed July 14, 2023 <-- I don't think this was discovered in SUMO. <-- UPDATE 31July2023: We believe this is fixed in: bug 1843637: "v115 fails to subscribe Imap subfolders at folder hierarchy-depth > 2; v <=102 works OK". This fix will be part of 115.1 which will be out the week of August 7th if things go as planned. <--fixed in 115.1

Minor issues

(not in order)

  • bug 1837152: "Add account context menu to unified toolbar get messages button" >-- comment from Martin: "We offer a context menu on the in-context get messages button that allows users to get messages for a specific account only. We should offer a similar context menu on the get messages button in the unified toolbar" <-- requires string changes so not going to be in 115.x
  • bug 1838589:Items in the view button are not persistent <- Better title: Eye icon > View > "Unread" is not persistent in Unified Toolbar (it reverts back to "All" when you switch folders in Unified toolbar)
  • bug 1843023: Keyboard shortcut wrong on macOS when running TB in Dutch <-- Dutch Keyboard shortcut for macOS is broken! Should be Command Q but it is Command F erroneously.
  • 1423319: Preview of new messages in inbox by hovering over inbox that was in 102 is gone in 115 <-- wayne: `The message snippets on hover is intentionally removed - it affects accessibility`
  • Middle click does nothing tb115, in 102 it opened a message tab in the background. There is as possibility the fix for this will be backported to 115. See bug 1842482 'Reimplement middle click "open message in a tab" action'
  • Unified Folders
  • add your issue here :-)
  • Printing
There is an (untested by me since I can't reproduce the problem) workaround (some subtle HTML formatting might be lost): 
# On Linux and Windows, hit the alt key to display the menu (not needed on Mac)
# View > Message Body As > Simple HTML
# Print the email

UserChrome and unsupported customizations


  • bug 1847658: "calendar invitation not send to attendees (but is sent to organizer)" <-- not fixed in 115.2.3
  • bug 1849540: Thunderbird freezes when adding CalDAV calendar with VTIMEZONE <-- "TB freezing only if two conditions are met: 1. The iCalendar file of the exported CalDAV calendar comprises the VTIMEZONE object and 2. The calendar is provided by the CalDAV server of Horde Groupware." <-- Deutsche Telekom is a provider with this issue. <-- from Sean "In summary, Horde generates invalid recurrence rules (aka RRULE) in its time zone definitions. Per the iCalendar spec, we should be ignoring these, but we fail to detect them and loop infinitely looking for an occurrence." --> bug closed as duplicate of bug 1850732: Importing .ics file (locally or remotely by CalDAV) ultimately freezes Thunderbird (Lightning) <-- trying for a fix in 115.2.3

MS OAuth & Exchange related issues (relevant tags: msoauth, exchange):

  • September 14, 2023: For hotmail,, and other email hosted on MS365 / Office 365, people in TB115 are seeing cannot send emails because: bug 1798875:migrate Office365 accounts to OAuth2 authentication (password only, Less secure apps will not work starting Oct 1, 2022): never migrated them successfully to OAuth2 before upgrade.
    • Solution: Delete the scopes for sending and receiving emails as per Microsoft OAuth Authentication and Thunderbird in 2023 (use the config editor to filter for "oauth2", find the appropriate server(s), and delete the entries for "oauth2.issuer" and "auth2.scope") or wait for a Thunderbird 115 build with the fix to bug 1814823: Saved scopes or other login info breaks Microsoft OAuth <-- fixed in 118b5, maybe uplifted to a future 115 build
    • Workaround: Switch to from OAuth back to "normal password" (as per reddit user momplaysbass:Cannot send email after upgrade to Thunderbird 115;;starttls on port 587;Authentication method: normal password) which still works in September 2023 even though it was supposed to stop working in October 2022: NB: normal passwords will eventually stop working so it's best to use OAuth2 as per the real Solution above.
  • bug 1814823 - Saved scopes or other login info breaks Microsoft OAuth <-- "If you can login on a new profile in Beta or 102.7.1+, but cannot on a profile that was created in 102.6.1 or earlier, you may be affected by this bug. " <-- fixed in 118b5, maybe uplifted to a future 115 build
  • Changing from OAuth to "normal password" allows people to send emails: 1419635
  • Another theory about some hotmail/ email issues is that people are entering their password into the "Set Up Your Existing Email Address" which causes it to fail. Instead folks should leave the password field blank and click Done which will cause their browser to open up and ask for the outh password. Instances of this issue: July 29, 2023: 1419686
  • 1419572: is a typical example of not being able send email <- Could wrong SMTP server in a multiple account situation (where 1 or more accounts are hotmail or or Microsoft/Office365 accounts?) be the cause of many people's issues?
  • Theories:
    • "Some admins refusing to approve Thunderbird and thus cutting off their users due to the new client ID. There's nothing we can do about this but advise users to talk to their admins."
    • "Folks already using OAuth2 who now have stale scopes due to us storing these as preferences. These users can delete the stale scopes, but that's a pain for them and we should probably do this for them automatically. (And long term, we shouldn't store scopes in preferences. Maybe we just fix it by getting rid of that.)"
    • "Folks who have SMTP disabled. This is easier to tell apart, because it's generally just that they can't send messages but can receive them."
    • Many possible other issues!


Often AV software breaks new versions of Thunderbird until the an update is released. Don't use AV from anybody except Microsoft if you are on Windows is my informal recommendation since all 3rd party AV are worse than MS's and break TB for longer in my anecdotal :-) experience


The following is an incomplete list of add-ons that have issues in Thunderbird 115. Please add to this list add-ons that have issues and if you find an add-on has been updated and works with Thunderbird, please strike it out using <del></del> (not in order,numbered for convenience)

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