I needed a simple 'button' to 'restart' Firefox. There is a 'real' button, and when you customize your toolbar (right click on toolbars), you can move the button and I put mine on the 'bookmark bar'. But you can leave it on the add-on toolbar and move it where you like it. As others have remarked, for me, no unusual or any 'pages' open to the authors site with option 2 or 3. If you choose an option which will depend on the additional add-on with timer functions, then yes, it opens an offer to buy and install it. I give the author 5 stars. And, depending on which option you choose, it DOES 'restart' the browser remembering which tabs were open a couple of ways. Thank you, Nacho.
(PS - There is also a secondary add-on which works with this one. I think it's $3.00 and gives you options to time restarts with other functions.)

Lo que hace realmente no es reiniciar el navegador, para eso está añadir a los marcadores esta página "about:profiles" (sin las comillas) o esta otra "about:restartrequired" (sin las comillas), pero esta extensión para bajar la cantidad de memoria que utiliza el navegador está muy bien. El mejor para mí es el método 2.
El método 1 también funciona pero tienes que preocuparte en grabar la sesión antes de apretar el botón. Gracias

What it really does is not restart the browser, for that it is to add to the bookmarks this page "about:profiles" (without the quotes) or this one "about:restartrequired" (without the quotes), but this extension to lower the amount of memory used by the browser is very good. The best for me is method 2.
Method 1 also works but you have to worry about recording the session before pressing the button. Thank you

https://i.imgur.com/cqNY06e.gifv