Add-Ons
I am currently using TB 68.12.1 along with add-ons such as QuickFolders, QuickFilters, Manually Sort Folders, Duplicate Contacts Manager, Colored Folders, Empty Folder, etc. The reason I will not update TB to 78.4 is because the add-ons I am currently using is not compatible with TB 78.4. Will QuickFolders be compatible with TB 78.4 as well as other add-ons and themes?
Opaite Mbohovái (1)
I suggest you read the reports on the add-on sites. QuickFolders and quickFiters have beta versions for 78, there's a version of Manually sort folders for 78, and there is a version of Colored Folders being developed.
https://addons.thunderbird.net/en-US/thunderbird/addon/quickfolders-tabbed-folders/
https://addons.thunderbird.net/en-US/thunderbird/addon/quickfilters/
https://addons.thunderbird.net/en-US/thunderbird/addon/colored-folders/reviews/1164294/
https://addons.thunderbird.net/en-US/thunderbird/addon/manually-sort-folders/