모든 제품 커뮤니티 포럼

Over the last 5 or 6 months, Firefox seems to have lost the capacity to remember my open tabs if my Mac is forced to restart. These open tabs are vital to my workflow. If this can't be solved, I shall have to migrate to another browser, which is something I do not wish to do.

My Firefox version is 147.0.4; my computer a Mac Studio 2025 M3 Ultra; my OS Tahoe 26.3.

Please advise.

WITHOUT FAIL, I AM INUNDATED WITH YOUR UPDATE POP UP ON A DAILY , AND, MOST TIMES, MORE OFTEN.

THIS HAS GONE ON FOR AT LEAST 5 YEARS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

ISN'T IT ABOUT TIME THAT YOU ''''''FIX YOUR PROBLEM?'''''''

Cut the crap and get your act together and yes, I clear my cashe, etc which DOES NOTHING - BUT YOU ALREADY KNOW THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

My TB 147.0.2 Release channel is using excessive amounts of memory. Below is the memory usage data.

Previously I was on the ESR channel for many years. Also I originally used the Lightning calendar plug.

What I'm seeing is that when TB starts the memory usage is high. If I check at another time on the same day it is sometimes only around 250-350MB.

I've tried suggest options like reducing data in Local Folders (on a separate data drive) but to no avail. As I type now TB memory usage is now only 286.4MB. However rest assured in a while this will jump back to over 3GB and it has an is now 3,151.4MB.

I don't see this on another 2 PCs. One is setup with Locals Folders and the other is just the mail Inbox and sub folders. The only other difference is that the PC with this TB installation also has one Newsgroup server configured.

There surely has to be a bug somewhere causing these excessive memory usages.

Main Process (pid 13380) Explicit Allocations

3,313,474,259 B (100.0%) -- explicit ├──3,179,427,220 B (95.95%) ── heap-unclassified ├─────38,393,176 B (01.16%) ++ window-objects ├─────38,283,520 B (01.16%) ++ js-non-window ├─────23,911,654 B (00.72%) ++ startup-cache ├─────11,605,760 B (00.35%) ++ storage ├──────5,005,920 B (00.15%) ++ images ├──────4,031,040 B (00.12%) ++ threads ├──────2,866,272 B (00.09%) ++ layout ├──────2,273,616 B (00.07%) ++ script-preloader ├──────1,422,800 B (00.04%) ── icu ├──────1,083,184 B (00.03%) ++ xpconnect ├────────917,568 B (00.03%) ++ dom ├────────704,416 B (00.02%) ++ atoms ├────────627,133 B (00.02%) ++ preferences ├────────546,544 B (00.02%) ++ gfx ├────────360,720 B (00.01%) ++ cycle-collector ├────────328,720 B (00.01%) ++ telemetry ├────────318,528 B (00.01%) ++ phc ├────────312,608 B (00.01%) ++ fog ├────────305,312 B (00.01%) ++ url-preloader ├────────212,528 B (00.01%) ++ network ├────────212,480 B (00.01%) ++ string-bundles ├────────166,128 B (00.01%) ++ data-storage ├─────────80,048 B (00.00%) ── profiler/profiler-state ├─────────42,356 B (00.00%) ── skia-font-cache ├─────────19,024 B (00.00%) ++ xpcom ├─────────10,064 B (00.00%) ── memory-reporter-manager ├──────────3,312 B (00.00%) ── xul-prototype-cache/other ├──────────1,904 B (00.00%) ── cookie-service ├────────────624 B (00.00%) ── history-links-hashtable ├─────────────80 B (00.00%) ── cert-storage/storage ├──────────────0 B (00.00%) ── maildb/database(UNKNOWN-FOLDER) ├──────────────0 B (00.00%) ── media/libogg ├──────────────0 B (00.00%) ── spell-check └──────────────0 B (00.00%) ++ webgl

Other Measurements

140,737,488,289,792 B (100.0%) -- address-space ├──138,527,509,839,872 B (98.43%) ── free(segments=402) ├────2,206,026,694,656 B (01.57%) ++ reserved └────────3,951,755,264 B (00.00%) ++ commit

273,510,400 B (100.0%) -- decommitted ├──269,578,240 B (98.56%) -- heap │ ├──268,451,840 B (98.15%) ── decommitted │ └────1,126,400 B (00.41%) ++ unused-pages └────3,932,160 B (01.44%) ── js-non-window/gc-heap/decommitted-pages

5,245 (100.0%) -- event-counts └──5,245 (100.0%) ++ window-objects

1 (100.0%) -- extensions └──1 (100.0%) ── Extension(id=default-theme@mozilla.org, name="System theme — auto", baseURL=moz-extension://d69e3532-324c-43f3-959c-7bc3f6aad1c5/)

3,580,661,760 B (100.0%) -- heap ├──3,311,083,520 B (92.47%) -- committed │ ├──3,272,606,352 B (91.40%) ── allocated │ ├─────28,273,376 B (00.79%) ── bookkeeping │ ├──────8,202,000 B (00.23%) ++ bin-unused │ ├──────1,785,856 B (00.05%) ── unused-pages/dirty │ └────────215,936 B (00.01%) ── waste └────269,578,240 B (07.53%) ++ decommitted

4,942,128 B (100.0%) -- images └──4,942,128 B (100.0%) -- content

  ├──4,934,128 B (99.84%) ++ vector
  └──────8,000 B (00.16%) ++ raster/used

19 (100.0%) -- ipc-channels ├───3 (15.79%) ── PBackgroundParent ├───3 (15.79%) ── PProfilerParent ├───1 (05.26%) ── PAPZInputBridgeChild ├───1 (05.26%) ── PBackgroundStarterParent ├───1 (05.26%) ── PCanvasManagerChild ├───1 (05.26%) ── PCompositorManagerChild ├───1 (05.26%) ── PContentParent ├───1 (05.26%) ── PGPUChild ├───1 (05.26%) ── PImageBridgeChild ├───1 (05.26%) ── PProcessHangMonitorParent ├───1 (05.26%) ── PRDDChild ├───1 (05.26%) ── PRemoteWorkerDebuggerManagerParent ├───1 (05.26%) ── PRemoteWorkerServiceParent ├───1 (05.26%) ── PVRManagerChild └───1 (05.26%) ── PVsyncBridgeChild

20 (100.0%) -- ipc-channels-peak ├───3 (15.00%) ── PBackgroundParent ├───3 (15.00%) ── PProfilerParent ├───2 (10.00%) ── PAPZInputBridgeChild ├───1 (05.00%) ── PBackgroundStarterParent ├───1 (05.00%) ── PCanvasManagerChild ├───1 (05.00%) ── PCompositorManagerChild ├───1 (05.00%) ── PContentParent ├───1 (05.00%) ── PGPUChild ├───1 (05.00%) ── PImageBridgeChild ├───1 (05.00%) ── PProcessHangMonitorParent ├───1 (05.00%) ── PRDDChild ├───1 (05.00%) ── PRemoteWorkerDebuggerManagerParent ├───1 (05.00%) ── PRemoteWorkerServiceParent ├───1 (05.00%) ── PVRManagerChild └───1 (05.00%) ── PVsyncBridgeChild

8 (100.0%) -- js-helper-threads ├──8 (100.0%) ── idle └──0 (00.00%) ── active

47,463,752 B (100.0%) -- js-main-runtime ├──17,759,904 B (37.42%) ++ realms ├──16,789,232 B (35.37%) ++ zones ├──11,440,056 B (24.10%) ── runtime └───1,474,560 B (03.11%) ++ gc-heap

11,691,152 B (100.0%) -- js-main-runtime-gc-buffers ├──11,270,624 B (96.40%) ── used ├─────218,656 B (01.87%) ── free └─────201,872 B (01.73%) ── admin

24,379,392 B (100.0%) -- js-main-runtime-gc-heap-committed ├──20,174,072 B (82.75%) ++ used └───4,205,320 B (17.25%) ++ unused

20 (100.0%) -- js-main-runtime-realms ├──13 (65.00%) ++ system └───7 (35.00%) ++ user

21 (100.0%) -- message-manager └──21 (100.0%) -- referent

  ├──10 (47.62%) -- child-process-manager
  │  ├──10 (47.62%) ── strong
  │  └───0 (00.00%) -- weak
  │      ├──0 (00.00%) ── alive
  │      └──0 (00.00%) ── dead
  ├───6 (28.57%) -- parent-process-manager
  │   ├──6 (28.57%) ── strong
  │   └──0 (00.00%) -- weak
  │      ├──0 (00.00%) ── alive
  │      └──0 (00.00%) ── dead
  └───5 (23.81%) -- global-manager
      ├──5 (23.81%) ── strong
      └──0 (00.00%) -- weak
         ├──0 (00.00%) ── alive
         └──0 (00.00%) ── dead

1,924 (100.0%) -- observer-service └──1,924 (100.0%) ++ referent

868 (100.0%) -- observer-service-suspect ├──437 (50.35%) ── referent(topic=xpcom-shutdown) ├──225 (25.92%) ── referent(topic=memory-pressure) └──206 (23.73%) ── referent(topic=last-pb-context-exited)

363 (100.0%) -- preference-service └──363 (100.0%) ++ referent

0 (100.0%) -- queued-ipc-messages └──0 (100.0%) ── content-parent(Browser, pid=2140, open channel, 0x228780fb828, refcnt=35)

147,366 B (100.0%) -- shared-string-bundles ├───65,420 B (44.39%) ── SharedStringBundle(url="chrome://global/locale/dom/dom.properties", shared=true, refCount=2, sharedMemorySize=65420) ├───24,560 B (16.67%) ── SharedStringBundle(url="chrome://global/locale/layout/htmlparser.properties", shared=true, refCount=2, sharedMemorySize=24560) ├───22,528 B (15.29%) ── SharedStringBundle(url="chrome://global/locale/security/security.properties", shared=true, refCount=2, sharedMemorySize=22528) ├───11,830 B (08.03%) ── SharedStringBundle(url="chrome://necko/locale/necko.properties", shared=true, refCount=2, sharedMemorySize=11830) ├────7,420 B (05.04%) ── SharedStringBundle(url="chrome://global/locale/css.properties", shared=true, refCount=2, sharedMemorySize=7420) ├────6,190 B (04.20%) ── SharedStringBundle(url="chrome://global/locale/layout_errors.properties", shared=true, refCount=2, sharedMemorySize=6190) ├────2,756 B (01.87%) ── SharedStringBundle(url="chrome://global/locale/commonDialogs.properties", shared=true, refCount=2, sharedMemorySize=2756) ├────2,358 B (01.60%) ── SharedStringBundle(url="chrome://global/locale/printing.properties", shared=true, refCount=2, sharedMemorySize=2358) ├────2,174 B (01.48%) ── SharedStringBundle(url="chrome://global/locale/layout/HtmlForm.properties", shared=true, refCount=2, sharedMemorySize=2174) ├────1,488 B (01.01%) ── SharedStringBundle(url="chrome://global/locale/mathml/mathml.properties", shared=true, refCount=2, sharedMemorySize=1488) ├──────246 B (00.17%) ── SharedStringBundle(url="chrome://branding/locale/brand.properties", shared=true, refCount=2, sharedMemorySize=246) ├──────226 B (00.15%) ── SharedStringBundle(url="chrome://global/locale/xul.properties", shared=true, refCount=2, sharedMemorySize=226) └──────170 B (00.12%) ── SharedStringBundle(url="chrome://global/locale/svg/svg.properties", shared=true, refCount=2, sharedMemorySize=170)

28,598,376 B (100.0%) -- window-objects ├──16,114,528 B (56.35%) ++ dom ├──12,432,968 B (43.47%) ++ layout └──────50,880 B (00.18%) ── property-tables

          262,144 B ── font-list-shmem
                0 B ── gfx-textures
                0 B ── gfx-textures-peak
                0 B ── gfx-tiles-waste
                  0 ── ghost-windows
                0 B ── gpu-committed
                0 B ── gpu-dedicated
                0 B ── gpu-shared
    3,272,606,352 B ── heap-allocated
        1,048,576 B ── heap-chunksize
                  0 ── imagelib-surface-cache-already-present-count
          304,880 B ── imagelib-surface-cache-estimated-locked
          314,928 B ── imagelib-surface-cache-estimated-total
                 85 ── imagelib-surface-cache-image-count
                 52 ── imagelib-surface-cache-image-surface-count
                 85 ── imagelib-surface-cache-locked-image-count
                 45 ── imagelib-surface-cache-locked-surfaces-count
                  0 ── imagelib-surface-cache-overflow-count
                  0 ── imagelib-surface-cache-table-failure-count
                  7 ── imagelib-surface-cache-tracked-cost-count
                  7 ── imagelib-surface-cache-tracked-expiry-count
                  0 ── imagelib-surface-cache-tracking-failure-count
          454,656 B ── js-main-runtime-temporary-peak
                  8 ── js-main-runtime-zone-count
    3,386,552,320 B ── private
    3,497,312,256 B ── resident
    3,369,873,408 B ── resident-unique
       29,638,345 B ── shmem-allocated
        2,612,339 B ── shmem-mapped
        6,256,466 B ── system-heap-allocated
2,209,978,449,920 B ── vsize

70,172,792,717,312 B ── vsize-max-contiguous

                0 B ── wasm-runtime
                  0 ── webgl-buffer-count
                0 B ── webgl-buffer-memory
                  0 ── webgl-context-count
                  0 ── webgl-renderbuffer-count
                0 B ── webgl-renderbuffer-memory
                  0 ── webgl-shader-count
                  0 ── webgl-texture-count
                0 B ── webgl-texture-memory

End of Main Process (pid 13380)

I accidentally deleted all cookies in my browser using an extension and want to restore them to how they were one day ago, but I can't find the restore button anywhere. I found an article on https://support.mozilla.org/en-US/kb/firefox-backup , but I don't have the buttons mentioned in the article. I don't have a “Restore your data” section or a “Choose backup file” button, and when I click on the link about:restore, I get the response “Hmm. That address doesn't look right.”

PLEASE HELP

I have several different local calendars set up in my Thunderbird. I want to unsubscribe to a specific one. When I select "Unsubscribe from Selected Calendar" from the Events and Tasks drop down, the Calendar selected is not the one I want to subscribe from. How do I select the Calendar I want to unsubscribe from prior to selecting that menu option. I have searched through the forums and have found references to opening a Calendar tab and right clicking on the left pane to select a Calendar. When I right click on the Calendar tab, I just get the options to Open in New tab or close the current tab. I'm not understanding something and I'd appreciate any clarification on this step. I am including a screen shot that shows the Unsubscribe screen. The calendar that is selected is my Google calendar, but I don't want to unsubscribe from Google. I want to unsubscribe from a duplicate local calendar. How do I do that?

 Thanks!

I successfully imported the self-signed CA certificate into thunderbird. Then I tried to import the p12 S/MIME client certificate and this error message popped up (cf. screenshot below).

However, I checked the client certificate and it seems fine:

1. openssl pkcs12 -in smime-client-certificate.p12 -info -noout

Enter Import Password: MAC: sha256, Iteration 2048 MAC length: 32, salt length: 8 PKCS7 Encrypted data: PBES2, PBKDF2, AES-256-CBC, Iteration 2048, PRF hmacWithSHA256 Certificate bag PKCS7 Data Shrouded Keybag: PBES2, PBKDF2, AES-256-CBC, Iteration 2048, PRF hmacWithSHA256

1. pk12util -l smime-client-certificate.p12

Enter password for PKCS12 file: Certificate(has private key):

   Data:
       Version: 3 (0x2)
       Serial Number: 1 (0x1)
       Signature Algorithm: PKCS #1 SHA-256 With RSA Encryption
       Issuer: "..."
       Validity:
           Not Before: Thu Feb 19 13:32:18 2026
           Not After : Sun Feb 17 13:32:18 2036
       Subject: "E=user@example.com,CN=user@example.com,
           O=example.com,ST=...,C=..."
       Subject Public Key Info:
           Public Key Algorithm: X9.62 elliptic edwards curve public key
       unknown SPKI algorithm type
       Raw:
           69:58:ee:5d:45:3f:10:d9:bb:8c:a3:b6:a5:c6:16:a6:
           53:78:65:77:73:5d:e0:6f:60:df:2c:32:f3:c2:e2:58
       Signed Extensions:
           Name: Certificate Basic Constraints
           Data: Is not a CA.

           Name: Certificate Key Usage
           Usages: Digital Signature
                   Non-Repudiation
                   Key Encipherment

           Name: Extended Key Usage
               E-Mail Protection Certificate

           Name: Certificate Subject Key ID
           Data:
               99:8a:6d:e4:ec:3a:25:5d:ad:26:a0:36:e1:da:a2:ea:
               bc:88:79:50

           Name: Certificate Authority Key Identifier
           Key ID:
               f5:6c:37:9a:37:d1:81:43:d3:54:3f:b9:33:23:85:c1:
               7e:17:73:88

           Name: Certificate Subject Alt Name
           RFC822 Name: "user@example.com"

   Signature Algorithm: PKCS #1 SHA-256 With RSA Encryption
   Signature:
       44:3a:5e:d7:44:51:f1:3c:a3:80:d8:54:f4:9c:d8:0b:
       ...
   Fingerprint (SHA-256):
       88:95:7A:DF:A5:7C:D1:E8:A5:55:A8:18:BD:BD:7D:92:1F:7D:6E:17:26:68:39:84:26:F3:F6:F3:4A:5C:56:90
   Fingerprint (SHA1):
       72:83:D0:13:C9:C9:AD:46:CA:C3:73:66:9E:79:5B:5C:3B:2E:81:47

Key(shrouded):

   Encryption algorithm: PKCS #5 Password Based Encryption v2 
       Encryption:
           KDF: PKCS #5 Password Based Key Derive Function v2 
               Parameters:
                   Salt:
                       dc:f9:bf:4a:80:e1:7c:4a:b4:f5:52:6b:9b:d5:75:ad
                   Iteration Count: 2048 (0x800)
                   KDF algorithm: HMAC SHA-256
           Cipher: AES-256-CBC
               Args:
                   04:10:0d:a4:96:03:00:2a:d5:a6:fe:d3:6c:a5:d0:12:
                   67:b3

What is going on and how to troubleshoot this issue as there is no logging about this matter into /var/log/syslog?

Environment: - Ubuntu 25.10 - thunderbird 2:1snap1-0ubuntu3

You jerks deleted passwords and bookmarks I needed for work just because I reset my password to login. Why in gods name would you think that's a good idea? Why would I ever use your sync function if you're gonna delete my data the moment you get the chance?

I have my browser.sessionstore.max_windows_undo in about:config set to 60 – it's been like this and working fine for several months.

It's set to this high number because I use an assistive technology which creates a fresh pop-up every time I deploy it, and Firefox treats it as a browser window closure when I close the pop-up. Consequently, I can easily rattle through well over 25 window closures in a day.

It's not necessarily that each window contains dozens of tabs and copious data, but nevertheless Firefox still treats it as a window 'within the meaning of the act'!

I just went to reopen one closed window from a couple days ago which did contain many tabs (partly why I closed it in the first place), only to find that the 'recently-closed windows' context menu is now only showing 20 windows (18 of which are the aforementioned pop-up assistive technology windows)

The really vital window that I want to reopen is not showing.

I've double checked in about: config and the browser.sessionstore.max_windows_undo is still set to 60 windows; nothing has been altered or reset.

I updated Firefox to 147.0.4 yesterday evening, but the problem existed before I updated Firefox, and is still in evidence since updating.

Two questions:

1) Why is the Recently Closed Windows context menu not showing the full number of windows it has been successfully doing with no problem now for months? I used to have to scroll down to access the full extent of the 60, but they were always there.

2) Why has it arbitrarily changed to 25 windows?

3) [I lied – Our chief weapons etc...] Is there a way that – given about:config still implies that the most recent 60 windows are retrievable – that I can access beyond the 25 windows limit that are currently showing as reopenable?

Thanks very much

(And yes, I already have things like OneTab and Tab Session Manager add-ons, but disabled those just before closing the important window, because I was trying to locate which add-on was draining the CPU. I assumed my 'recently-closed windows' buffer of 60 would suffice while I disabled the add-ons.)

The command STAT did not work. Failure at fetching of message regarding numbers and sizes. E-postservern mailin.telia.com answered: Invalid command; Valid commands: CAPA, DELE, LIST, LAST, NOOP, RETR, RSET, STAT, TOP, UIDLorQ UIT.

I can't access Bookmarks anymore, I have many saved sites and I can't find them anymore? What can I do? My configuration has completely changed and I don't know where to start? I can't even translate with Google, it keeps stopping

Up until today I have never had trouble accessing My [edited from community support forum] @deamer.org address for the Deamer.org website But to day I am completely block our by Fire fox for even getting to Deamer.org and I get this message Did Not Connect: Potential Security Issue

Firefox detected an issue and did not continue to 408916.svc.e1m.net. The website is either misconfigured or your computer clock is set to the wrong time.

It’s likely the website’s certificate is expired, which prevents Firefox from connecting securely.

What can you do about it?

408916.svc.e1m.net has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.

Learn more…

Hi! So I have Windows 10, but don't know if that's what's causing these issues. Certain websites, that is, Instagram, Bluesky, Youtube, Yahoo, Facebook, and Norwegian news site NRK, as far as I've seen, are not loading properly. Insta and NRK are in simple mode, no matter how many times I refresh Yahoo initially says "failed to load", then resolves itself upon refreshing, but it's really annoying to have to refresh for every message and going back to the main inbox Youtube videos are stuck on the spinny wheel of death, and along with Reddit, one other symptom is that the profile pictures won't load. Reddit posts also won't load beyond the first few, and "continue thread" doesn't do anything Facebook won't load at all, still nothing as I refreshed just now. Bluesky, I'm not sure is Firefox's fault, or what, but I get the "Oops network error", at least on one user, it turns out, but not another, nor on Bluesky main page (I swear, it sometimes feels like at least Meta has something against Vivienne Medrano, because I was also having issues with Insta not showing posts in full screen mode before this became an issue, and it was only majority Hellaverse accounts that had these issues. The Bluesky account that won't load is also a Hellaverse account. Either way, that's not here nor there regarding this issue)

What on Earth is going on?! Is it that I have too many tabs? I do have around 1000 tabs, which I guess could be an issue, but it hasn't been until today, two or so hours ago. I was even fine last night! Is 1000 the limit, or something? I do have some ad removers, which btw, some other video watching sites suddenly won't load the videos unless I turn the adblocks off, not cool

Please respond quickly, I am losing my mind here /halfjoking -Helene

Good day! Initially, I installed Firefox version (x64 ru) 147.0.3. After updating via the "Help - About Firefox - Update" menu, I received version 147.0.4. However, there are two entries about installed Firefox in the Windows section "Installed applications": 1. Mozilla Firefox (x64 ru) 147.0.3 and 2. Mozilla Firefox (x64 ru) 147.0.4. Although one instance of the program is installed. How do I remove an extra entry? Thank you.

PS: I have Windows 11 Pro 25H2 (26200.7840, 1000.26100.291.0) Russian CPU AMD Ryzen 5 5600X 6-Core Processor RAM 32,0 ГБ System x64 Video NVidia GeForce 1650

... just that. Actually I wanted to print a selection, but if the selection is longer than one page, only one page will print. So I thought if I could save the selection to a file, and then print that file, I'd solve my problem.