[Bug 1899309] Re: firefox leaks memory and crashes computer (lack of swap)

[Oibaf]

Two suggestions that should address all your points:

1) install zram-config package, it will give you more virtual memory, creating a compressed swap area in RAM;
2) since Ubuntu 20.10/groovy you can install nohang package, it should detect low memory situation and close the program or browser tab using too much memory. I also packaged a newer nohang version for Ubuntu 20.04/focal and 20.10/groovy in my PPA (consider my PPA as experimental).

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Title:
  firefox leaks memory and crashes computer (lack of swap)

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