Hello @vlad, indeed it would be easier to continue the conversation on https://github.com/aaFn/Bookmark-search-plus-2/issues, but let's see how far we can go here.

First, I do not have a Macbook, so I rely on a virtual MacOS in a VM, that might introduce differences.
Second, my MacOS VM is on Monterey 12.2.1, that might also be a difference with you.

Anyway, based on FF 129.0.1, and on BSP2 v2.0.129, I am not able to reproduce any of the 3 symptoms you mention:
- d&d of links or tabs or existing bookmarks in a folder, new or existing, is immediate, and no error on my side
- the second symptom makes me think of a regression I fixed in 2.0.129, can you make sure that you have the latest BSP2 version ?
- on the third, I must say I am puzzled .. the right click menu [not Ctrl-right click] has indeed "Bookmark Tab Here" [without the "(s)" part on "Tab", only one tab, the current one], but it does not ask for a folder name, it does not create one, and it has no limit to 30 characters on the folder name where the bookmark is created from the current tab, nor on the bookmark name itself. If you keep Ctrl pressed when clicking on the action, the properties menu opens on bookmark creation to ask you to modify the name, and here also, no 30 characters limit (and frankly, there was never such a limit in my code !).

So net is that I am not able to reproduce the problems, or maybe I need a litte more precision, sorry to be slow if so.