While a great extension, it is now abandoned and outdated.
It's newer and more up to date fork TablissNG actually accomplishes all the features this extension promises unlike some of them being broken/defunct in this extension and also adding many new welcome additions.
While also offering major quality-of-life improvements like a dark mode, and the ability to customise widget position to anywhere on the page just to name a couple.
Please, give the "TablissNG" extension a try, simply export your preferences from this extension and import them into that one. It's that easy :3