Hello, thank you.
I guess I see in fact 2 changes to do here:
- when opening properties, if already open, re-focus on the already open one instead of opening a second one (I will verify this is possible)
- currently, when changing the value of a field in the property window, the bookmark value is immediately changed = this was the old behavior of FF when I created the add-on some years ago, a bit strange but this is what it was .. and so I mimicked it .. and so Cancel is restoring the old values when opening the property window.
However, this behavior now changed in FF, so I will look at going back to a more natural flow, where values are only changed when pressing "Save" (and so Cancel should do nothing, as the name says).

============ update 05/11/2023 ===========
Both changes made in 2.0.119 which is out now. Let me know on https://github.com/aaFn/Bookmark-search-plus-2/issues if any problem.
And yes, this is non modal. And by the way, it can't be modal, as the FF Web extension (add-ons) API does not allow modal windows as of today, to my knowledge.
Thank you, aaFn.