Very good tool for the bookmarks.
The icon is standard and not consistent with the use of extension, please choice an other like a folder or a letter B or something like that.
In addition is very similar to an other extension "Simple Add-on Manager" at https://addons.mozilla.org/en-US/firefox/addon/simple-add-on-manager/?src=api.
Better if black like the official Firefox toolbar icons.
Thanks.