It would be helpful to have the option to be able to rename tabs. This could help to easily differentiate between tabs that have the same name by default, such as some email clients or messaging applications.
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@ADGrimes @Jon That would be interesting here: https://connect.mozilla.org/t5/ideas/native-tab-grouping-more-customizable-tab-bar/idi-p/303 Because if you have many tabs as mentioned you could rename to check what you were doing