Changelog for Thunderbird 124

The following WebExtension API changes were introduced in Thunderbird 124.

api menus

• type MenuIconDictionary — A dictionary object to specify paths for multiple icons in different sizes, so the best matching icon can be used, instead of scaling a standard icon to fit the pixel density of the user’s display. Each entry is a name-value pair, with name being a size and value being a menus.MenuIconPath.

api runtime

• event onPerformanceWarning — Fired when a runtime performance issue is detected with the extension. Observe this event to be proactively notified of runtime performance problems with the extension.

• type OnPerformanceWarningCategory — The performance warning event category, e.g. ‘content_script’.

• type OnPerformanceWarningSeverity — The performance warning event severity. Will be ‘high’ for serious and user-visible issues.