I have lots of tabs open(24) and segregated them in tab-groups, when I try to open thegeekstuff website the firefox uses more than 6G of RES memory and 2GB RAM
it crashed my entire Linux Box once. Unless I get into terminal mode and use top command to kill the firefox process, my system just crashes. I was able to simulate this error couple of times to. Each time FF ends up using closer to 6GB of RES memory(Unswapped Physical memory). Just before this moment the usage was high but around 1.1GB,but after that one tab it exponentially increased. Firefox doesnt crash, just hangs. Normal usage below from about:memory 1,160.63 MB ── explicit
752.02 MB ── heap-allocated
803.01 MB ── heap-committed
107.98 MB ── heap-unallocated
779 ── page-faults-hard
7,290,026 ── page-faults-soft
1,240.98 MB ── resident 2,298.45 MB ── vsize. One last thing I also have FF Sync enabled, and use a FF at home with Windows on it, so some plugins/add-ons are windows only, but error I encountered is from my Fedora Core Linux Desktop.
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You have a lot of extensions installed. Each one of those comes with a cost in memory and cpu resources. My advice would be to turn all the non-essential ones off. You also might want to disable add-on sync.
You might also consider running Firefox Aurora. It's currently version 14 but will be updated to 15 probably tomorrow. It now prevents add-on memory use from spiraling out of control (but again they all cost some amount of memory).