There’s a plugin I found very usefull, sidebars list https://addons.mozilla.org/en-US/firefox/addon/sidebars-list/ (Which won’t be ported to FF57 as far as I know),
It’s functionality has for the most part been integrated into FF with the “show sidebars” button, but there is one aspect of its functionality that “show sidebars” doesn’t have and that I’d like to replicate.
With sidebars list I had a small border (2 or 3 pixels wide) along the left side of the browser window, that I could click to open or close the sidebar.
Doesn’t seem like much, but it was extremely practical, as I didn’t have to precisely go hit the button, I would just point anywhere on the left border, click, and voila.
Basically it’s a 2-4 pixel wide button that acts like the show sidebar button and that spans the whole left side of the browser window
Do you know of a way to make this border/button @andrei ?