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Hi,
I've been using your toolbar buttons extension for a long time and just recently with FF 53 your quick bookmarks button has stopped working. I use that button a lot and actually don't know how to make a bookmark go into a folder without it. I found a way around with another extension but it's still not as easy as your one button. That's the only button I seem to have trouble with in your extension. I was wondering if there's a chance you'll be fixing it but if not, I understand as a lot of extension developers are giving up on Firefox because of FF 57. If you can fix it, great. It's a great extension.
Thank you.