very useful extension Rated 5 out of 5 stars
I've been using Stay-Open since it became available, and I've had no problems with it. It does exactly what its description says it does. :)
The author is very responsive to feedback. I reported a small bug (middle-clicking folders didn't work), and within a few days there was a new version with the fix.
I find it invaluable for picking out a few bookmarks to open without having to drill down through the menu each time. This is especially useful to me when I want to open several of the items in a live bookmark's feed.
For earlier versions of Firefox, I used the middleclicknocollapse extension, which gave some of the functionality Stay-Open does. Having gotten used to it, it would be very difficult for me to live without. And Stay-Open is quite an improvement over middleclicknocollapse -- Stay-Open also handles the history menu. So, thanks very much, custom.firefox.lady!