expanding bookmark folders

I imported my favorites from IE into Firefox, in hopes of using your browser. I can see my favorites imported if I use the bookmarks menu at the top and move the mouse to expand the folders. I want my folders on the left, like they appeared in IE. I found an add on (LibraryinSidebar) and used it and thought my problem was solved. I can see my favorites from IE there and all the the folders. I cannot click or expand those folders. If I right click it allows me open in separate tabs, simply not feasible as some folders have a few hundred links. Can you please tell me how I can view my IE bookmarks in IE in the left sidebar and be able to leave that open on the side, opening a folder at a time, clicking items within those folders. Thank you