One Firefox user revealed that she has a habit of never closing tabs, and that she currently has a total of 7,470 tabs. The reason she gave was nostalgia, and she likes to scroll back and look at old tabs from time to time, “like a trip down memory lane to record what I'm doing/learning/thinking about.” So many tabs don't affect Mac Computer performance, due to Firefox's high memory efficiency and the fact that inactive tabs are not actually loaded and therefore do not take up memory. A Mozilla representative said that opening a large number of tabs does not consume any memory, and said that the tab group feature is being developed to manage large numbers of tabs. “More than 7,000 tabs is incredible, but it also shows that managing tabs is a common problem.” ”
https://www.pcmag.com/news/firefox-power-user-keeps-7400-plus-browser-tabs-open-for-2-years
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