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Memory use unaccounted for

Firefox Crashing and slow performance
A complete amateur
A complete amateur

I can only use firefox for 90 minutes at a time, before the entire system crashes.

Since the last couple of updates, the infamous memory leak issue has gotten significantly worse. Now 30 minutes of use with no add-ons sees the memory use swell to 13 GB, crashing the system. Sometimes windows 10 crashes, sometimes it just kills firefox.

The thing is, when I check about:memory, it says firefox is only using 1.5 GB. However task manager says 13 GB, and if I close the browser, suddenly 13 GB memory gets freed up.

Does anyone have any idea why there's such a discrepancy?

I can only use firefox for 90 minutes at a time, before the entire system crashes. Since the last couple of updates, the infamous memory leak issue has gotten significantly worse. Now 30 minutes of use with no add-ons sees the memory use swell to 13 GB, crashing the system. Sometimes windows 10 crashes, sometimes it just kills firefox. The thing is, when I check about:memory, it says firefox is only using 1.5 GB. However task manager says 13 GB, and if I close the browser, suddenly 13 GB memory gets freed up. Does anyone have any idea why there's such a discrepancy?