/usr/share/vim/addons/syntax/notmuch-folders.vim is in notmuch-vim 0.17-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | " notmuch folders mode syntax file
syntax region nmFoldersCount start='^' end='\%10v'
syntax region nmFoldersName start='\%11v' end='\%31v'
syntax match nmFoldersSearch /([^()]\+)$/
highlight link nmFoldersCount Statement
highlight link nmFoldersName Type
highlight link nmFoldersSearch String
highlight CursorLine term=reverse cterm=reverse gui=reverse
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