6.13.1 - Published 12/07/2026

The full log with screenshots is available at: quickFilters Change Log

This release updates quickFilters to reflect recent changes in Thunderbird’s add-on platform planning. A previously announced restriction that would allow legacy Add-ons on the Release channel only has been postponed to a later ESR cycle (currently targeted for 2027).

While quickFilters continues to support both Release and ESR versions of Thunderbird where compatible, it may be better to switch to the ESR channel to secure a more stable update path.

Users who rely on advanced or experimental functionality may prefer the ESR channel for a more stable environment with fewer platform changes. The recommended migration point from Release to ESR is Thunderbird 153, expected in July 2026.

Improvements

• Fixed a bug where the main Thunderbird window content was moved up and caused truncation [issue #382]. If you are seeing this behavior, please restart Thunderbird to make sure the changes come into effect.
• Remember position of Filter Assistant window. New option to force assistant to the top. [issue #380]
• Improved QuickFolders current folder bar integration stability [issue #365]

Bug Fixes

• Fixed an issue where cached debug settings were not read after the migration to local storage. [issue #367]
• Filter assistant not using correct built in template (domain instead from) [issue #376]

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.13 - Published 03/07/2026

Release 6.13

The full log with screenshots is available at: quickFilters Change Log

This release updates quickFilters to reflect recent changes in Thunderbird’s add-on platform planning. A previously announced restriction that would allow legacy Add-ons on the Release channel only has been postponed to a later ESR cycle (currently targeted for 2027).

While quickFilters continues to support both Release and ESR versions of Thunderbird where compatible, it may be better to switch to the ESR channel to secure a more stable update path.

Users who rely on advanced or experimental functionality may prefer the ESR channel for a more stable environment with fewer platform changes. The recommended migration point from Release to ESR is Thunderbird 153, expected in July 2026.

Improvements

• Compatibility updates for Thunderbird 154
• Added Czech translation
• Search filters can now be found by target folder URI (folder path) [issue #366]
• Improved integration of QuickFolders current folder bar [issue #365]

Settings & Storage

• Converted quickFilters settings to use local storage instead of Thunderbird's global preferences [issue #367]
• Improved communication between quickFilters and QuickFolders [issue #373]

Bug Fixes

• Fixed HTML Assistant issue where message preview API was not available when moving mail to local folders [issue #364]
• Set minimum supported Thunderbird version to 140 to avoid deprecated API issues [issue #362]

Compatibility

• Updated default GitHub branch alignment to ESR140

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.12.3 - Published 08/06/2026

The full log with screenshots is available at: quickFilters Change Log

This version uses the old ESR115 branch back fixing important bugs to push changes to users of older Thunderbird versions (before ESR 140)

Maintenance Update 6.12.3

• Compatibility with Thunderbird 152
• Fixed an issue where message preview was unavailable when moving mail to local folders [issue #364]
• Fixed: License key restore has the wrong key (QuickFolders instead of quickFilters)

Improvements

• Compatibility with Thunderbird 151
• Added: “Switch to Free Version” option and license backup / recovery after key expiry [issue #354]
• Improved: Toolbar icons now reflect the main theme color [issue #357]

Bug Fixes

• Fixed: Message Filters ⇒ New... ⇒ Copy... creates TWO Copies. [issue #341]
• Fixed: Replaced deprecated showAlertNotification with showAlert [issue #349]
• Fixed: List-Id header case sensitivity caused filter creation with template "Mailing Lists" to fail. From now on, all custom header comparisons are case-insensitive for higher stability. [issue #350]
• Fixed: quickFilters Assistant is now again triggered by manual tag changes (broken in Thunderbird 147) [issue #346]
• Fixed: “Remove duplicate condition” context menu item was missing an icon [issue #359]

Miscellaneus

• Fixed: Right-clicking a Thunderbird account in the folder tree caused a console error [issue #356]
• Domain Renewal mislabelled. [issue #360]
• Fixed: colors of buttons in registration dialog - these could lead to unusable button in macOS.

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.12.2 - Published 6/4/2026

The full log with screenshots is available at: quickFilters Change Log

Improvements

• Compatibility with Thunderbird 151
• Added: “Switch to Free Version” option and license backup / recovery after key expiry [issue #354]
• Improved: Toolbar icons now reflect the main theme color [issue #357]

Bug Fixes

• Fixed: Message Filters ⇒ New... ⇒ Copy... creates TWO Copies. [issue #341]
• Fixed: Replaced deprecated showAlertNotification with showAlert [issue #349]
• Fixed: List-Id header case sensitivity caused filter creation with template "Mailing Lists" to fail. From now on, all custom header comparisons are case-insensitive for higher stability. [issue #350]
• Fixed: quickFilters Assistant is now again triggered by manual tag changes (broken in Thunderbird 147) [issue #346]
• Fixed: “Remove duplicate condition” context menu item was missing an icon [issue #359]

Miscellaneus

• Fixed: Right-clicking a Thunderbird account in the folder tree caused a console error [issue #356]
• 6.12.1 (30/3/2026) Domain Renewal mislabelled. [issue #360]
• 6.12.2 (6/4/2026) Fixed: colors of buttons in registration dialog - these could lead to unusable button in macOS.

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.12 - Published 29/03/2026

The full log with screenshots is available at: quickFilters Change Log

Improvements

• Compatibility with Thunderbird 151
• Added: “Switch to Free Version” option and license backup / recovery after key expiry [issue #354]
• Improved: Toolbar icons now reflect the main theme color [issue #357]

Bug Fixes

• Fixed: Message Filters ⇒ New... ⇒ Copy... creates TWO Copies. [issue #341]
• Fixed: Replaced deprecated showAlertNotification with showAlert [issue #349]
• Fixed: List-Id header case sensitivity caused filter creation with template "Mailing Lists" to fail. From now on, all custom header comparisons are case-insensitive for higher stability. [issue #350]
• Fixed: quickFilters Assistant is now again triggered by manual tag changes (broken in Thunderbird 147) [issue #346]
• Fixed: “Remove duplicate condition” context menu item was missing an icon [issue #359]

Miscellaneus

• Fixed: Right-clicking a Thunderbird account in the folder tree caused a console error [issue #356]

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.11. - Published 27/01/2026

The full log with screenshots is available at: quickFilters Change Log

Improvements

• Added option for extracting parent folder names in default filter naming rules for Move/Copy actions [issue #290]
• Allow merging of a single mail to group filter [issue #342]
• Enhanced Filter Naming: configurable blacklist that removes words from subject and possibility to extract multiple bracketed expressions from an email subject. [issue #343]
• Improved subject matching: detect subjects starting with the same word combos [issue #344]

Bug Fixes

• Fixed: Message Filters ⇒ New... ⇒ Copy... creates TWO Copies. [issue #341]

Miscellaneus

• Retired the old settings dialog (xul will be deprecated in the future)

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.10 - Published 04/01/2026

The full log with screenshots is available at: quickFilters Change Log

Improvements

• Set Compatibility with Thunderbird 148 - unfortunately the Add-on review policies for Add-ons with "experimental" APIs do not allow us to remove strict_max_version from manifest.json
• Improved startup stability [issue #339]
• Improved default filter names based on Custom Templates [issue #335]
• Added a configurable keyboard shortcut for 'Create Filter from Message' [issue #334]
• If the quickFilters assistant is already open, trying to start a new one will bring the existing window to the front instead of opening another. (quickFilters.Worker.createQuickFilterLock)

Bug Fixes

• Fixed: The Thunderbird filter editor was missing the search term edit box when search terms did not retrieve any value (e.g. no Reply-To, missing mail tags) [issue #338]
• Fixed: After quickFilters 6.9.2 HTML Assistant - "Automatically select Merge" was not honored (needed to be selected each time) [issue #331]
• Fixed: Extend License button opens 2 tabs [issue #333]

Miscellaneus

• Custom Template Editor / Filter Editor: gFilter was removed in modern versions of Thunderbird
• Removed invalid permissions folders and mailTab from manifest.

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.9.2 - Published 03/11/2025

The full log with screenshots is available at: quickFilters Change Log

Maintenance Release 6.9.2

• Compatibility with Thunderbird 146
• Set HTML Assistant as default
• Added the targeted filter name to the edit filter button for clarity.
• Improved merging filters in the new HTML assistant: API calls are now more robust and the data type problem in the new Filters API is fixed
• Fix: Always reliably remove "Go Pro" menu item when news are displayed with a valid license
• Removed assignments to innerHTML in update/install welcome screens

Maintenance Release 6.9.1

• Various accessibility improvements in the new HTML settings dialog including life URL updates, correct reusing of an already existing tab.
• Update of settings heading logo to reflect license status
• Fixed: The new HTML Settings quickFilters Pro page was not configured properly without license key [issue #330]
• Fixed: Current folder buttons (on the QuickFolders toolbar) don't update immediately [issue #328]
• Added in HTML settings: Click on expiry date to show "extend license" button. [issue #329]

Improvements

• Compatibility with Thunderbird 145
• Converted Settings Dialog from XUL to HTML [issue #325]
• Removed obsolete "Start Filter Assistant" from Composer's tool menu [issue #324]

Bug Fixes

• Fixed: Merging filters broken in new html assistant [issue #322] [issue #327]
• Fixed: Thunderbird 143: Custom Filter Template elements missing [issue #326]
• Fixed: "Mailing List" filter template shows alert: "currentHeaderData is not defined" [issue #323]

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.9.1 - Published 30/10/2025

The full log with screenshots is available at: quickFilters Change Log

Maintenance Release 6.9.1

• Various accessibility improvements in the new HTML settings dialog including life URL updates, correct reusing of an already existing tab.
• Update of settings heading logo to reflect license status
• Fixed: The new HTML Settings quickFilters Pro page was not configured properly without license key [issue #330]
• Fixed: Current folder buttons (on the QuickFolders toolbar) don't update immediately [issue #328]
• Added in HTML settings: Click on expiry date to show "extend license" button. [issue #329]

Improvements

• Compatibility with Thunderbird 145
• Converted Settings Dialog from XUL to HTML [issue #325]
• Removed obsolete "Start Filter Assistant" from Composer's tool menu [issue #324]

Bug Fixes

• Fixed: Merging filters broken in new html assistant [issue #322] [issue #327]
• Fixed: Thunderbird 143: Custom Filter Template elements missing [issue #326]
• Fixed: "Mailing List" filter template shows alert: "currentHeaderData is not defined" [issue #323]

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.

6.9- published 22/10/2025

The full log with screenshots is available at: quickFilters Change Log

Improvements

• Compatibility with Thunderbird 145
• Converted Settings Dialog from XUL to HTML [issue #325]
• Removed obsolete "Start Filter Assistant" from Composer's tool menu [issue #324]

Bug Fixes

• Fixed: Merging filters broken in new html assistant [issue #322] [issue #327]
• Fixed: Thunderbird 143: Custom Filter Template elements missing [issue #326]
• Fixed: "Mailing List" filter template shows alert: "currentHeaderData is not defined" [issue #323]

All development and free support work for quickFilters is financed via the quickFilters Pro license which also adds some additional features.