2059182 - Thunderbird logs missing Fluent message for the built-in default theme

Status: RESOLVED FIXED

(Thunderbird :: Upstream Synchronization, defect, P3)

Description

[Toby Pilling [:tobyp]]

After the changes to bundled theme localization, Thunderbird logs the following warnings at startup and when opening the Themes pane in about:addons:

[fluent] Missing message in locale en-US: extension-default-theme-name
[fluent] Couldn't find a message: extension-default-theme-name

The affected add-on is Thunderbird’s built-in default theme:

[e-mail]

For this theme, getL10nIdForThemeProp(addonId, "name") correctly returns:

extension-default-theme-name-auto

However, getL10nThemeString() bypasses that mapping for Thunderbird and constructs the Fluent ID directly:

extension-default-theme-name

Thunderbird does not define that ID. As a result, Fluent resolution returns undefined and XPIDatabase falls back to the theme manifest value. The visible theme name therefore remains correct, but the bundled localization lookup fails and generates repeated console warnings.

Browser Console verification:

{
  prefix: "default-theme",
  genericNameId: "extension-default-theme-name-auto",
  thunderbirdResolvedName: undefined
}

Comment 1

[Toby Pilling [:tobyp]]

Attachment: Bug 2059182 - Fix Thunderbird default theme Fluent localization. r=rpl

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/43c75e4b6fbd
https://hg.mozilla.org/integration/autoland/rev/d358251311cb
Fix Thunderbird default theme Fluent localization. r=rpl

Comment 3

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/d358251311cb