Notice: You have been identified as a bot, so no internal UID will be assigned to you. If you are a real person messing with your useragent, you should change it back to something normal.
Anonymous B joined in and replied with this 7 years ago, 1 hour later[^][v]#907,909
Apparently, you change the boxy tabs by editing your userChrome.css as mentioned here. I don't think you can do it through themes anymore since Mozilla had a "let's break all the things!" party with v57 and WebExtensions. If you are still tied to your old setup, you can use Firefox ESR or there are a few forks like Waterfox or Pale Moon that will run like older versions of Firefox.
(Edited 2 minutes later.)
Anonymous C joined in and replied with this 7 years ago, 6 hours later, 8 hours after the original post[^][v]#907,943
Maagd
Sheila LaBoof (OP) replied with this 7 years ago, 1 hour later, 9 hours after the original post[^][v]#907,950
@907,909 (B)
indeed
I find it telling that Firefox would have the word Chrome in their fucking files
I've been goofing around with SeaMonkey already https://www.seamonkey-project.org/
Sheila LaBoof (OP) double-posted this 7 years ago, 8 hours later, 17 hours after the original post[^][v]#908,061
in folder named profile, create folder named chrome
in folder named chrome, create text file but erase txt extension, and name it userChrome.css
in the userChrome file, copy and past the blob of css shit from that web page, save file
restart browser