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This add-on would probably deserve to be merged to the core, but only if improved to only apply to Gmail and Google Workspace, for all languages as 'All Mail' might change based on the display language configured in Gmail), and maybe optimize the performance a bit when checking for duplicates (the aItems email collection could be projected once into a dictionary of emails indexed by messageId).

The code to patch is in https://github.com/mozilla/releases-comm-central/blob/master/mailnews/db/gloda/modules/GlodaSyntheticView.jsm and should be updated using the logic in implementation.js (instead of monkey patching).

However, a better fix would be to prevent downloading emails in All Mail in the first place if they are already present in another folder. But this sounds a bit more complex to achieve, as we can't know if the emails are present in another folder until we've checked all folders. The email headers should suffice as the message ID is identical so it should help with the performance, but still it isn't trivial to implement it optimally to not slow things down, and Thunderbird may not have ready logic to use to avoid loading some emails (and hiding them without deleting them) within a folder.