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According to the Microsoft Windows Task Manager, Firefox tends to just use 1 CPU core for most of its processing.

When a system isn't running any foreground tasks besides Firefox, this leaves much processor power unused.

Is it possible to have Firefox use more than 1 CPU core (either virtual or physical cores)?

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    Firefox already run in multiple processes since FF 48. I don't see it consumes only 1 CPU
    – phuclv
    Commented Jun 1, 2022 at 15:24
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    Are you perhaps misinterpreting the situation? Does Firefox actually have enough work to put multiple cores to use? Keep in mind that Javascript, for example, is single-threaded.
    – Daniel B
    Commented Jun 1, 2022 at 15:40
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    Firefox already uses multiple cores and is multi-threaded. if I am not mistake, every single tab is actually it's own process, this is done for security and performance reasons. I suspect you are not reading the results from Task Manager correctly (or perhaps it's simplifying the situation.
    – Ramhound
    Commented Jun 1, 2022 at 16:01
  • I would be annoyed if WEBPAGES required multiprocessing. => High CPU load, hot computer, fans busy all the time... further; if a webpage requires more than minimal CPU power I tend to not visit that place more than once; because then it is "faulty" in my opinion.
    – Hannu
    Commented Jun 1, 2022 at 19:05
  • @DanielB You mentioned that JavaScript is single-threaded. To confirm, does that mean a webpage can literally only have a single thread of JavaScript running at once, and that the thread will only run a single core?
    – End Antisemitic Hate
    Commented Jun 2, 2022 at 14:12

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