Programmer Number Influence Memory Consuption

I've noticed a strong correlation between the number of programmers developing a program and that program's memory consumption. If company has 10 programmers, then its product would take 50 megabytes RAM, if it has 100 employees that would be 500 Mb RAM. For example, Mozilla has more than 1000 employees, and Firefox requires several megabytes RAM. Dillo has just a few developers and its memory consumption is below 50 Mb. Same appears to be true for operating systems: early Windows NT has a small development team, which appeared to have very informal development practices (judging from a lot of swear words in comments), so Windows NT required just few megabytes to run, while modern Windows 10 requires gigabytes.

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it has less to do with the number of developers and more to do with the complexity of the software and also what tools they’re using.

Actually, number of developers directly influences the complexity. If you have one developer, he will use single set of tools for everything, while having two you will multiply the number of tools used. Large projects even use several different versions of the same library. Moreover, if the number of developers is above certain threshold, then efficient communication between them becomes impossible and you have to break the project into distinct parts, that operate using well defined interfaces, but have completely independent internal structures, duplicating and re-inventing a lot of functionality.