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Why does Firefox 64.0 use so much memory in Xubuntu 18.04.1?

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firewire.p5k
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I have a problem with my new install of xubuntu 18.04.1: Firefox uses about 58% of my 2GB of memory.

On my old install of Xubuntu 16.04 it used about 400 Mb and I don't know where the difference suddenly comes from.

I can find on the web some things about changing preferences but that is not the answer I think. It should work after a clean install.

I only found this but the last entry is about 2 months old

https://bugzilla.mozilla.org/show_bug.cgi?id=1462162

1 down vote favorite 1 I have a problem with my new install of xubuntu 18.04.1: Firefox uses about 58% of my 2GB of memory. On my old install of Xubuntu 16.04 it used about 400 Mb and I don't know where the difference suddenly comes from. I can find on the web some things about changing preferences but that is not the answer I think. It should work after a clean install. I only found this but the last entry is about 2 months old https://bugzilla.mozilla.org/show_bug.cgi?id=1462162