I would like to suggest a small but, in everyday use, very helpful improvement to Thunderbird's tab handling.
I prefer to open individual emails in separate tabs. However, when I double-click a message in the message list that is already open in a tab, Thunderbird opens the same message again in another new tab.
It would be much more convenient if Thunderbird first checked whether this particular message is already open in one of the existing tabs.
If the message is already open, Thunderbird should simply switch to and activate that tab. If the message is not yet open, it should open a new tab as it does now.
Ideally, this could be implemented as an optional setting, for example:
“Reuse an existing tab if the message is already open.”
This would preserve the current behaviour for users who prefer it, while preventing users who keep several messages open for their work from accidentally accumulating multiple tabs containing exactly the same email.
For example:
I double-click Email A → Thunderbird opens Email A in a new tab.
I return to the Inbox and work with other messages.
Later, I double-click Email A again → Thunderbird recognizes that Email A is already open and switches to its existing tab instead of opening Email A a second time.
This seems like a relatively small usability improvement, but it would make working with multiple message tabs considerably clearer and more efficient.
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