lopan
If your menu bar is hidden: Hamburger icon in top right hand corner > Original profile (or whatever profile is listed there) > Edit this profile > Choose a theme other than System.
If using the menu bar: Profiles > Manager Profiles > Click the pencil icon on Original profile > Choose a theme other than System.
Things I do like - No installation required. No subscription. It's a bit like Workflowy and a bit like Treesheets (as mentioned previously), but I find it easier to read than either. It's fast.
As someone who suspects that they might have partial ADHD, I love that there are several ways you can put a "spotlight" on what you are working on (depending on the theme) - 1) Selecting more than one line causes other lines to be greyed out; 2) "Highlight" changes the background colour of the current line; and 3) "Focus" causes everything except the immediate branch to be hidden! So good!
Looking forward to the future and more stability. :-)
https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...
https://addons.mozilla.org/en-US/firefox/addon/vertical-tabs...