Senti, puoi fare una cosa? Fai per prima cosa un backup del cartella del profilo (con Firefox rigorosamente chiuso).
Poi cancella la cache. Se il problema persiste prova a cancellare anche i cookie.
maggiori informazioni in https://support.mozilla.org/it/kb/Cancellare%20la%20cronologia%20recente
Non so se ti rivolgevi anche a me, pertanto rispondo. Ho fatto, cancellato tutto ma proprio tutto, e non ho altri programmi aperti. Task Manager sceso a 159 Mega.
Analisi FF è questa
Main Process
Explicit Allocations
117.20 MB (100.0%) -- explicit
├───45.63 MB (38.93%) -- add-ons
│ ├──45.62 MB (38.93%) -- {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
│ │ ├──45.60 MB (38.91%) -- js-non-window/zones/zone(0x3e40800)/compartment([System Principal], jar:file:///C:/Documents%20and%20Settings/Administrator/Dati%20applicazioni/Mozilla/Firefox/Profiles/y039bjjt.default/extensions/%7Bd10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d%7D.xpi!/bootstrap.js (from: resource://gre/modules/XPIProvider.jsm:3880))
│ │ │ ├──36.79 MB (31.39%) -- gc-heap
│ │ │ │ ├──33.68 MB (28.73%) -- objects
│ │ │ │ │ ├──25.81 MB (22.02%) ── ordinary
│ │ │ │ │ ├───7.79 MB (06.64%) ── dense-array
│ │ │ │ │ └───0.08 MB (00.07%) ++ (2 tiny)
│ │ │ │ ├───3.04 MB (02.60%) -- shapes
│ │ │ │ │ ├──2.89 MB (02.46%) ── dict
│ │ │ │ │ └──0.15 MB (00.13%) ++ (2 tiny)
│ │ │ │ └───0.07 MB (00.06%) ── scripts
│ │ │ ├───7.77 MB (06.63%) -- objects-extra
│ │ │ │ ├──5.83 MB (04.98%) ── slots
│ │ │ │ ├──1.32 MB (01.13%) ── elements/non-asm.js
│ │ │ │ └──0.61 MB (00.52%) ── property-iterator-data
│ │ │ └───1.04 MB (00.89%) ++ (6 tiny)
│ │ └───0.02 MB (00.02%) ── dom/non-window-global?!/orphan-nodes
│ └───0.00 MB (00.00%) ++ {3d7eb24f-2740-49df-8937-200b1cc08f8a}/js-non-window/zones/zone(0x3e40800)/compartment([System Principal], chrome://flashblock/content/flashblock.xul)
├───44.17 MB (37.69%) -- js-non-window
│ ├──32.70 MB (27.90%) -- zones
│ │ ├──24.01 MB (20.49%) -- zone(0x3e40800)
│ │ │ ├───9.69 MB (08.27%) -- gc-heap
│ │ │ │ ├──9.15 MB (07.81%) -- strings
│ │ │ │ │ ├──5.02 MB (04.28%) ── short
│ │ │ │ │ └──4.13 MB (03.53%) ── normal
│ │ │ │ └──0.54 MB (00.46%) ++ (4 tiny)
│ │ │ ├───8.82 MB (07.52%) ++ (156 tiny)
│ │ │ └───5.50 MB (04.70%) -- string-chars
│ │ │ ├──4.84 MB (04.13%) ── non-huge
│ │ │ └──0.66 MB (00.56%) ++ huge
│ │ ├───8.47 MB (07.22%) -- zone(0xf74800)
│ │ │ ├──5.05 MB (04.31%) -- string-chars
│ │ │ │ ├──4.65 MB (03.96%) ── non-huge
│ │ │ │ └──0.41 MB (00.35%) ++ huge
│ │ │ ├──3.41 MB (02.91%) -- gc-heap
│ │ │ │ ├──3.38 MB (02.89%) -- strings
│ │ │ │ │ ├──2.03 MB (01.73%) ── short
│ │ │ │ │ └──1.35 MB (01.15%) ── normal
│ │ │ │ └──0.03 MB (00.03%) ++ (2 tiny)
│ │ │ └──0.00 MB (00.00%) ── compartment(atoms)/other-sundries
│ │ └───0.22 MB (00.19%) ++ (4 tiny)
│ ├───7.77 MB (06.63%) -- runtime
│ │ ├──4.00 MB (03.41%) ── atoms-table
│ │ ├──2.69 MB (02.30%) ── script-data
│ │ └──1.08 MB (00.92%) ++ (10 tiny)
│ └───3.71 MB (03.17%) -- gc-heap
│ ├──1.94 MB (01.65%) ++ (2 tiny)
│ └──1.77 MB (01.51%) ── unused-arenas
├────9.35 MB (07.98%) ── heap-unclassified
├────5.85 MB (04.99%) -- window-objects
│ ├──3.25 MB (02.77%) -- top(chrome://browser/content/browser.xul, id=3)
│ │ ├──3.09 MB (02.64%) -- active
│ │ │ ├──3.06 MB (02.61%) -- window(chrome://browser/content/browser.xul)
│ │ │ │ ├──1.69 MB (01.44%) ++ js-compartment([System Principal], about:blank)
│ │ │ │ └──1.37 MB (01.17%) ++ (4 tiny)
│ │ │ └──0.03 MB (00.03%) ++ window(about:blank)
│ │ └──0.16 MB (00.13%) ++ js-zone(0x6311800)
│ └──2.60 MB (02.22%) ++ (5 tiny)
├────4.30 MB (03.67%) -- storage
│ ├──2.70 MB (02.30%) ++ sqlite
│ └──1.60 MB (01.37%) ++ prefixset
├────3.25 MB (02.78%) ++ (14 tiny)
├────3.16 MB (02.70%) -- workers/workers()/worker(resource://gre/modules/osfile/osfile_async_worker.js, 0x438a400)
│ ├──1.64 MB (01.40%) ++ (4 tiny)
│ └──1.52 MB (01.30%) -- gc-heap
│ ├──1.49 MB (01.27%) ── unused-arenas
│ └──0.03 MB (00.03%) ++ (2 tiny)
└────1.47 MB (01.26%) -- startup-cache
├──1.47 MB (01.26%) ── mapping
└──0.00 MB (00.00%) ── data
Other Measurements
0.00 MB (100.0%) -- decommitted
├──0.00 MB (100.0%) ── js-non-window/gc-heap/decommitted-arenas
└──0.00 MB (100.0%) ── workers/workers()/worker(resource://gre/modules/osfile/osfile_async_worker.js, 0x438a400)/gc-heap/decommitted-arenas
179 (100.0%) -- js-compartments
├──166 (92.74%) ── system
└───13 (07.26%) ── user
93.60 MB (100.0%) -- js-main-runtime
├──57.86 MB (61.82%) -- compartments
│ ├──43.80 MB (46.79%) -- gc-heap
│ │ ├──36.64 MB (39.14%) -- objects
│ │ │ ├──26.67 MB (28.50%) ── ordinary
│ │ │ ├───7.93 MB (08.47%) ── dense-array
│ │ │ ├───1.80 MB (01.92%) ── function
│ │ │ └───0.24 MB (00.25%) ── cross-compartment-wrapper
│ │ ├───5.94 MB (06.34%) -- shapes
│ │ │ ├──3.20 MB (03.42%) ── dict
│ │ │ ├──1.69 MB (01.81%) -- tree
│ │ │ │ ├──1.41 MB (01.51%) ── global-parented
│ │ │ │ └──0.28 MB (00.30%) ── non-global-parented
│ │ │ └──1.05 MB (01.12%) ── base
│ │ └───1.23 MB (01.31%) ── scripts
│ ├───8.85 MB (09.45%) -- objects-extra
│ │ ├──6.80 MB (07.26%) ── slots
│ │ ├──1.37 MB (01.46%) ── elements/non-asm.js
│ │ └──0.68 MB (00.73%) ++ (2 tiny)
│ ├───2.88 MB (03.07%) -- shapes-extra
│ │ ├──1.52 MB (01.62%) ++ (3 tiny)
│ │ └──1.36 MB (01.45%) ── compartment-tables
│ ├───1.44 MB (01.54%) ── type-inference/analysis-pool
│ └───0.90 MB (00.96%) ++ (7 tiny)
├──24.26 MB (25.92%) -- zones
│ ├──13.49 MB (14.41%) -- gc-heap
│ │ ├──12.59 MB (13.45%) -- strings
│ │ │ ├───7.08 MB (07.56%) ── short
│ │ │ └───5.51 MB (05.89%) ── normal
│ │ └───0.90 MB (00.96%) ++ (4 tiny)
│ ├──10.73 MB (11.47%) -- string-chars
│ │ ├───9.65 MB (10.31%) ── non-huge
│ │ └───1.08 MB (01.16%) ++ huge
│ └───0.04 MB (00.04%) ++ (2 tiny)
├───7.77 MB (08.30%) ── runtime
└───3.71 MB (03.96%) -- gc-heap
├──1.77 MB (01.89%) ── unused-arenas
├──1.00 MB (01.07%) ── unused-chunks
└──0.94 MB (01.00%) ── chunk-admin
61.00 MB (100.0%) -- js-main-runtime-gc-heap-committed
├──57.93 MB (94.97%) -- used
│ ├──56.65 MB (92.87%) ── gc-things
│ ├───0.94 MB (01.54%) ── chunk-admin
│ └───0.35 MB (00.57%) ── arena-admin
└───3.07 MB (05.03%) -- unused
├──1.77 MB (02.91%) ── arenas
├──1.00 MB (01.64%) ── chunks
└──0.29 MB (00.48%) ── gc-things
0 (100.0%) -- low-memory-events
├──0 (100.0%) ── physical
└──0 (100.0%) ── virtual
2.06 MB (100.0%) -- window-objects
├──1.13 MB (54.78%) -- layout
│ ├──0.65 MB (31.63%) ── style-sets
│ ├──0.31 MB (15.06%) ── pres-shell
│ ├──0.06 MB (03.16%) ── rule-nodes
│ ├──0.05 MB (02.49%) ── frames
│ ├──0.03 MB (01.70%) ── style-contexts
│ └──0.02 MB (00.74%) ++ (3 tiny)
├──0.48 MB (23.44%) -- dom
│ ├──0.27 MB (13.18%) ── element-nodes
│ ├──0.17 MB (08.27%) ── other
│ ├──0.03 MB (01.62%) ── orphan-nodes
│ └──0.01 MB (00.36%) ++ (4 tiny)
├──0.45 MB (21.74%) ── style-sheets
└──0.00 MB (00.04%) ── property-tables
0.00 MB ── gfx-d2d-surfacecache
0.00 MB ── gfx-d2d-surfacevram
0.00 MB ── gfx-d2d-vram-drawtarget
0.00 MB ── gfx-d2d-vram-sourcesurface
0.15 MB ── gfx-surface-win32
0.00 MB ── gfx-textures
0 ── ghost-windows
52.32 MB ── heap-allocated
55.14 MB ── heap-committed
2.80 MB ── heap-committed-unused
5.36% ── heap-committed-unused-ratio
0.75 MB ── heap-dirty
5.65 MB ── heap-unused
0.00 MB ── images-content-used-uncompressed
60.00 MB ── js-gc-heap
0.20 MB ── js-main-runtime-temporary-peak
0 ── low-commit-space-events
151.09 MB ── private
154.78 MB ── resident
2.70 MB ── storage-sqlite
237.52 MB ── vsize
A occhio, per quel poco che capisco io, mi sembra che il maggior problema sia Java. Ciao