This article details how to synchronize custom Thunderbird tags across multiple devices using an IMAP server by modifying the Thunderbird configuration editor (about:config). It involves adding arguments for custom tag labels and colors to ensure they aren't stored locally and are available on all connected devices.
However, it's unclear whether this method is needed now that Thunderbird supports tag editing directly in the desktop UI.
In Thunderbird email client, tags are used to organize and group messages manually or through filters. They can be assigned and removed via the context menu, toolbar, or message header, and are case-insensitive. Tags are stored differently depending on whether you use POP or IMAP accounts, and their color is determined by the lowest-numbered tag assigned. The article also discusses differences between tags and labels, interoperability with other email clients, and various add-ons that enhance tag functionality.
