6.16.3 - Published 18/06/2026

Release 6.16.3

• Fixed: Thunderbird 152 had a regression not resetting the quick search field when clicking go to next unread mail after using the 'Find related mails' function. [issue #676]
• Set max version to 153.* for supporting the upcoming ESR channel.

Release 6.16.2

We fixed a serious regression in v6.12.1 where the messages window content area was cut off at the top [issue #673]. You may have to restart Thunderbird to see this fix fully working.

Release 6.16.1

This release updates QuickFolders to reflect recent changes in Thunderbird’s add-on platform planning. A previously announced restriction affecting Experiment APIs on the Release channel has been postponed to a future ESR cycle (currently targeted for 2027).

No action is required at this time. QuickFolders continues to work on both Release and ESR versions of Thunderbird where supported.

Users who rely on advanced or experimental functionality may prefer the ESR channel for a more stable environment with fewer platform changes. The best point in time to migrate your existing profile from Release to ESR is when Thunderbird 153 will be published in July 2026.

Improvements

• Set minimum version to Thunderbird 140 to avoid problems with deprecated APIs and to focus on modern Thunderbird versions [issue #664].
• Added compatibility for Thunderbird 152.

Bug Fixes

• quickJump search box could lose focus on macOS Tahoe 26.4 [issue #658].
• Drag & Drop in subfolders menu broken on macOS Tahoe 26.4 [issue #659].
• Settings window could leave current folder label in a stuck state [issue #666].
• Unstyled buttons in v6.15 registration dialog (Extend / Renew license) [issue #660].

Miscellaneous

• Created new GitHub default branch aligned with ESR140 for upcoming Thunderbird 140+ development track.

6.16.2 - Published 10/06/2026

Release 6.16.2

We fixed a serious regression in v6.12.1 where the messages window content area was cut off at the top [issue #673]. You may have to restart Thunderbird to see this fix fully working.

Release 6.16.1

This release updates QuickFolders to reflect recent changes in Thunderbird’s add-on platform planning. A previously announced restriction affecting Experiment APIs on the Release channel has been postponed to a future ESR cycle (currently targeted for 2027).

No action is required at this time. QuickFolders continues to work on both Release and ESR versions of Thunderbird where supported.

Users who rely on advanced or experimental functionality may prefer the ESR channel for a more stable environment with fewer platform changes. The best point in time to migrate your existing profile from Release to ESR is when Thunderbird 153 will be published in July 2026.

Improvements

• Set minimum version to Thunderbird 140 to avoid problems with deprecated APIs and to focus on modern Thunderbird versions [issue #664].
• Added compatibility for Thunderbird 152.

Bug Fixes

• quickJump search box could lose focus on macOS Tahoe 26.4 [issue #658].
• Drag & Drop in subfolders menu broken on macOS Tahoe 26.4 [issue #659].
• Settings window could leave current folder label in a stuck state [issue #666].
• Unstyled buttons in v6.15 registration dialog (Extend / Renew license) [issue #660].

Miscellaneous

• Created new GitHub default branch aligned with ESR140 for upcoming Thunderbird 140+ development track.

6.16.1 - Published 29/05/2026 - reviewed 09/06/2026

Release 6.16.1

This version went live on 09/06/2026.

This release updates QuickFolders to reflect recent changes in Thunderbird’s add-on platform planning. A previously announced restriction affecting Experiment APIs on the Release channel has been postponed to a future ESR cycle (currently targeted for 2027).

No action is required at this time. QuickFolders continues to work on both Release and ESR versions of Thunderbird where supported.

Users who rely on advanced or experimental functionality may prefer the ESR channel for a more stable environment with fewer platform changes. The best point in time to migrate your existing profile from Release to ESR is when Thunderbird 153 will be published in July 2026.

Improvements

• Set minimum version to Thunderbird 140 to avoid problems with deprecated APIs and to focus on modern Thunderbird versions [issue #664].
• Added compatibility for Thunderbird 152.

Bug Fixes

• quickJump search box could lose focus on macOS Tahoe 26.4 [issue #658].
• Drag & Drop in subfolders menu broken on macOS Tahoe 26.4 [issue #659].
• Settings window could leave current folder label in a stuck state [issue #666].
• Unstyled buttons in v6.15 registration dialog (Extend / Renew license) [issue #660].

Miscellaneous

• Created new GitHub default branch aligned with ESR140 for upcoming Thunderbird 140+ development track.

6.16 - Published 23/05/2026

Release 6.16

This release prepares QuickFolders for upcoming Thunderbird platform changes. Starting with Thunderbird 153, legacy and privileged add-ons will require the ESR channel. Users on the regular release track may need to switch to Thunderbird ESR 153 to continue using full functionality.

We strongly recommend ensuring you are on a supported ESR version if you rely on advanced QuickFolders features.

Improvements

• Set minimum version to Thunderbird 140 to avoid problems with deprecated APIs and to focus on modern Thunderbird versions [issue #664].
• Added compatibility for Thunderbird 152.

Bug Fixes

• quickJump search box could lose focus on macOS Tahoe 26.4 [issue #658].
• Drag & Drop in subfolders menu broken on macOS Tahoe 26.4 [issue #659].
• Settings window could leave current folder label in a stuck state [issue #666].
• Unstyled buttons in v6.15 registration dialog (Extend / Renew license) [issue #660].

Miscellaneous

• Created new GitHub default branch aligned with ESR140 for upcoming Thunderbird 140+ development track.

6.15.1 - Published 30/03/2025

Maintenance Release 6.15.1

• Fixed: Navigation button could remain highlighted (green) after toggling (Thunderbird 149) [issue #657]
• Fixed: Previously removed custom folder icon could reappear after restarting Thunderbird [issue #651]

Improvements (6.15)

• Flat Style improvement: the active folder now highlights with the user-assigned tab color (if set). You can revert to the original behavior in theme settings [issue #646]
• Redesigned themes: Native Tabs and Pushbuttons refreshed with a new layout [issue #643]
• Toolbar icons now reflect the main theme colors instead of using hard-coded values, improving consistency especially in custom themes [issue #655]
• Improved theme handling: switching themes now resets layout rules for full fidelity [issue #650]
• New Pro feature: show the account name of the current folder instead of the QuickFolders label [issue #648]
• Custom icons in the folder tree are now automatically resized and no longer cropped when too large [issue #619]
• Added an option to temporarily switch to the Basic version after license expiry without losing your license. The license key is backed up locally and can be restored later [issue #652]

Bug Fixes (6.15)

• Fixed duplicate custom icons in the folder tree on Thunderbird 148 [issue #633]
• Fixed non-working menu items in the QuickFolders Commands submenu [issue #639]
• Fixed broken XHTML dialog "Change order of tabs" [issue #647]
• Fixed: Removed custom folder icon reappeared after restarting Thunderbird [issue #651]
• Fixed: Changes in Advanced search settings ("quickMove Advanced Settings") were not stored [issue #654]

Miscellaneous (6.15)

• Removed usage of PluralForm.sys.mjs to align with Thunderbird code changes [issue #653]
• Removed unnecessary console errors from quickfolders-util.js

6.15 - Published 19/03/2025

Release 6.15

QuickFolders has been fully modernized for 2026, with a refreshed user interface, improved usability, and enhanced theme support — making your folder management faster, cleaner, and more intuitive than ever. Try the new Thunderbird Tabs theme for a fresh, minimalist experience.

Improvements

• Flat Style improvement: the active folder now highlights with the user-assigned tab color (if set). You can revert to the original behavior in theme settings [issue #646]
• Redesigned themes: Native Tabs and Pushbuttons refreshed with a new layout [issue #643]
• Toolbar icons now reflect the main theme colors instead of using hard-coded values, improving consistency especially in custom themes [issue #655]
• Improved theme handling: switching themes now resets layout rules for full fidelity [issue #650]
• New Pro feature: show the account name of the current folder instead of the QuickFolders label [issue #648]
• Custom icons in the folder tree are now automatically resized and no longer cropped when too large [issue #619]
• Added an option to temporarily switch to the Basic version after license expiry without losing your license. The license key is backed up locally and can be restored later [issue #652]

Bug Fixes

• Fixed duplicate custom icons in the folder tree on Thunderbird 148 [issue #633]
• Fixed non-working menu items in the QuickFolders Commands submenu [issue #639]
• Fixed broken XHTML dialog "Change order of tabs" [issue #647]
• Fixed: Removed custom folder icon reappeared after restarting Thunderbird [issue #651]
• Fixed: Changes in Advanced search settings ("quickMove Advanced Settings") were not stored [issue #654]

Miscellaneous

• Removed usage of PluralForm.sys.mjs to align with Thunderbird code changes [issue #653]
• Removed unnecessary console errors from quickfolders-util.js

6.14.2 - Published 21/12/2025

Maintenance changes 6.14.2

• Fixed message replacement and disabled update message newsMsgEsr140.
• Updated translations - added missing settings label for 'Notifications'

Maintenance changes 6.14.1

• 6.14.1 Fixed an issue with setting the "has news" flag: these were omitted since 6.11.1.

Improvements 6.14

• Made compatible with Thunderbird 148
• Added option to reverse alphabetic sorting of subfolder menus [issue #600]
• quickMove: Update cursor position while typing in folder search box [issue #623]
• Remove duplicate 🔎 and ✕ icons in quickMove search - Tb Release (142+) [issue #624]
• Added option to disable folder notifications after folder compaction (e.g., empty Trash) [issue #626]

Bug Fixes 6.14

• Fixed: Recent folders button missing on Current Folder Toolbar [issue #620]
• Fixed "rectangle" icons in current folder popups
• Fixed ❯ chevron positions on all popup menus
• Fixed icons in mail commands popups

Miscellaneous 6.14

• Reduced debug logs in error console mostly related to 'loadDictionary' [issue #621]

6.14.1 - Published 18/12/2025

Maintenance changes 6.14.1

• 6.14.1 Fixed an issue with setting the "has news" flag: these were omitted since 6.11.1.

Improvements 6.14

• Made compatible with Thunderbird 148
• Added option to reverse alphabetic sorting of subfolder menus [issue #600]
• quickMove: Update cursor position while typing in folder search box [issue #623]
• Remove duplicate 🔎 and ✕ icons in quickMove search - Tb Release (142+) [issue #624]
• Added option to disable folder notifications after folder compaction (e.g., empty Trash) [issue #626]

Bug Fixes 6.14

• Fixed: Recent folders button missing on Current Folder Toolbar [issue #620]
• Fixed "rectangle" icons in current folder popups
• Fixed ❯ chevron positions on all popup menus
• Fixed icons in mail commands popups

Miscellaneous 6.14

• Reduced debug logs in error console mostly related to 'loadDictionary' [issue #621]

6.14 - Published 15/12/2025

Improvements

• Made compatible with Thunderbird 148

• Added option to reverse alphabetic sorting of subfolder menus [issue #600]
  

• Added option to disable folder notifications after folder compaction (e.g., empty Trash) [issue #626]
  

• quickMove: Update cursor position while typing in folder search box [issue #623]

• Remove duplicate 🔎 and ✕ icons in quickMove search - Tb Release (142+) [issue #624]

Bug Fixes

• Fixed: Recent folders button missing on Current Folder Toolbar [issue #620]
• Fixed "rectangle" icons in current folder popups
• Fixed ❯ chevron positions on all popup menus
• Fixed icons in mail commands popups

Miscellaneous

• Reduced debug logs in error console mostly related to loadDictionary [issue #621]

6.13.1 - Published 17/10/2025

Maintenance Release 6.13.1

• Made compatible with Thunderbird 145.*

  There is a bug on thunderbird.net that may not be propagated to some users when we increase max version compatibility; this can lead to a false report of the Add-on appearing as incompatible with the current version.

  I raised a bug with Thunderbird to address this problem: [Bugzilla 1986027]. Please vote with us for getting this fixed!

• Added Norwegian locale [issue #617].

Improvements 6.13

• Made compatible with Thunderbird 143
• Fixed missing/broken menu icons in all popup menus of Thunderbird 143 [issue #602]
• Minimized impact of "News Flag" — now displayed as a badge icon 🟠 [issue #607]
• Intermittently, current folder bar was not displayed on main 3pane (first) tab [issue #608]
• Toolbar button icons sometimes don’t update immediately when changing themes [issue #611]

Bug Fixes

• Fixed: QuickFolders toolbar was not displayed on startup in Thunderbird 143, with toggle button not working [issue #609]
• Folder navigation buttons can now be removed independently of Message Navigation buttons - they were falsely linked to the message navigation settings [issue #610]

Unconfirmed

• quickMove with history should move mail but jumps to folder instead [issue #606] I have seen this rare behavior intermittently and am currently investigating how to fully replicate it