firefox-csshacks
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FF 71.0 show scolling arrow up and bellow single line of tabs
Starting FF 71.0 instead of multiple lines it show just one line and scrolling arrow above and bellow tabs instead of left and right to list of tabs.
Did you pull the new changes from this repository into your local files? It is working fine here (ff 71.0 and the latest version of this repository)
Multi-row tabs css should be working in Firefox 71, 72 and 73. So perhaps you own stylesheet is just out of date?
I deleted content of /chrome and put there "multi-row_tabs.css" renamed to "userChrome.css" to simplify test. Default Window buttons (close,window,minimize) are bellow tabs and tabs are still one row only.

Well, based on the screenshot there is definitely some other stylesheet also applied - not just multi_row_tabs.css.
Could you check if you are actually modifying the correct profile? I kinda think that you are modifying files of one profile but then launching Firefox that loads another profile.