I was frustrated with the latest Firefox/Proton UI so I have Mixed up everything in to One - Australis - Tabs below bookmark - Custom Release
In short I have mixed a couple of scripts into one with tabs below bookmarks (not my original work)
Anyone who want this you can get it from here
Go to → about:config and set “toolkit.legacyUserProfileCustomizations.stylesheets” to “true” to enable these customizations.
If you don’t, Firefox will ignore your userChrome.css and userContent.css files.
Create a folder chrome - unzip everything to that folder and you are done.