There was something to do with menu bar in multi-row_tabs_below_content.css, so I replaced that file with the latest versions of the two new replacement files, multi-row_tabs.css and tabs_below_content_v2.css. This did indeed restore the menu bar, but it broke tab bar scrolling (and a few other incidentals).
multi-row_tabs.css + tabs_below_content_v2.css is indeed the intended method to achieve what you are after (at least, if you are using my styles). I don't have normal ESR 140 installed, but with Tor browser, which is based on it, when tabs span over the maximum number of lines then they scroll as intended using mouse wheel. What are the "few other incidentals"? Perhaps that might yield a clue about why it isn't working on your system.
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