I really like how simple this add-on is. The icon looks like an inverted "show history" icon in the address bar. It looks organic in Firefox UI. Also I like the idea that the icon is on toolbar. BUT like Albert71292 said, the extension needs to automatic switching to a lighter color when the theme is dark. Also the extension color is a bit darker than the "show history" icon. I am a perfectionist, so it annoys me a little :)
Please, pay attention to my review! I spent a lot of time writing this review, since I don’t know english well. I will appreciate that.

Needs an option to make the URL bar icon a lighter color. Almost invisible with the dark Firefox theme. Other than that, it solves the issue of getting to the top of the page fast, like Opera's built in "click on open tab" feature.

Just what I was after for this all new Firefox layout. Any chance in doing a Scroll Down

Sehr praktisches Add-on