>>2268208The browser is Icecat but any Firefox based browser will work.
>extensions4chan X and OneeChan for 4chan and I used Firefox Color to change the colors for the rest of the browser. For the older style tabs you have to change "toolkit.legacyUserProfileCustomizations.stylesheets" to "true" in about:config and edit your userChrome.css file, here's a pastebin for mine, for you to look at
https://pastebin.com/FYDjsm0N. In case you don't have userChrome.css file, you can make one, just put it in "/home/USER/.mozilla/firefox/WHATEVER.default/chrome". If you don't have the chrome directory, make that as well.
