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sɛur Jim Kirk di Feb. 15, 2019 · aseɣwen yezgan

TB 60.5.1 (32-bit), with 1.2.1, nothing shows in Sort Account tab. Had this problem for quite a while with previous versions of this add on.

Only solution I found is to get your hands on this xpi version
"manually_sort_folders-1.2.0pre2.xpi."

Then install it from file using the gear icon at the top of Add-on manager. Once installed turn auto updates off for this extension.

Here's the link showing this is a known problem and a source for "manually_sort_folders-1.2.0pre2.xpi"

https://github.com/protz/Manually-Sort-Folders/issues/70