Review for All Menus Button by Dan Moorehead | PowerAccess (PowerAccess.net)
Rated 1 out of 5 stars
No toolbar button can be found available to add or on any toolbar for Firefox v55+, fir Developer/Beta/Nightly Editions, not sure for Firefox stable, but will be the case for it soon if not already.
To create your own collections, you must have a Mozilla Add-ons account.