Hi rexlan, I'm attaching a screenshot showing the minimum and maximum width when I drag the separator line:

Is your minimum wider than mine, or still too wide? There probably is a CSS way to override the minimum in that case, but I haven't researched it myself. A good site to get advice on CSS hacks, if you don't get one here, is:

https://www.reddit.com/r/FirefoxCSS/

Edit: in case you are wondering, the coloring of the icons is from this section of my site: https://www.userchrome.org/what-is-userchrome-css.html#colorbookmarkfolder

Thanks for the reply ... yes I did drag it as far as possible already and should have noted that in the original post.

I will look at the other place you suggested too - thank you.

I have spent a lot of time on this but no success so far. This was given on the Reddit forum as suggested and it works perfect.

1. sidebar-header,
2. sidebar {

 min-width: 10px !important;
 max-width: unset !important;

}