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Firefox is very laggy with many (discarded) tabs and huge sessionstore.jsonlz4

Problem: Firefox glitches a lot if the total number of all tabs exceeds 4129, and the sessionstore.jsonlz4 file in the profile has a large size. Details: Some interface e… (閱讀更多)

Problem: Firefox glitches a lot if the total number of all tabs exceeds 4129, and the sessionstore.jsonlz4 file in the profile has a large size.

Details: Some interface elements stop displaying normally after some time after opening 4130 tab, 4131 tab or more - popup menus, extension menus, Firefox menus, contextual menus, hovering popup windows, etc. They're either not displayed at all or partially displayed. The problem is purely visual - these elements are present and can be clicked on with the mouse, they just aren't displayed correctly. The more tabs open after 4129, the faster and harder the Firefox lags. When I quickly open more than 50 tabs after 4129, the browser usually stops displaying anything and completely freezes. The problem also appears some time after restarting the browser. Closing all tabs above the limit of 4129 completely solves the problem.

What have I done to solve the problem and what isn't working:

  • tried running the browser in "safe-mode" (without extensions and hardware acceleration);
  • tried running my firefox-profile in a new clean firefox client of the same version (87);
  • tried running my firefox-profile in a new clean firefox client of the latest version (94);
  • tried running my firefox-profile on another computer with significantly more RAM (32GB);
  • tried running my firefox-profile with sessionstore.jsonlz4 saved earlier (a week earlier)
  • tried running my sessionstore.jsonlz4 in a brand new profile;
  • combinations of all steps above.

Partial solution: The problem is definitely related to the sessionstore.jsonlz4 file from the profile. But since this file is critically important to me, I can't just create a new blank one. I tried creating a brand new one based on the old one, but smaller in size (I used [this](https://addons.mozilla.org/en-US/firefox/addon/sidebery/) extension). The old sessionstore.jsonlz4 (A) is 10.2MB, the new one (B) is 631KB. This difference in size is due to the fact that the new file doesn't contain data in the "image" attribute of tabs. In old (A) sessionstore.jsonlz4 67% of the space was taken up by the "image" attribute (it seems to be responsible for displaying the icons on the tabs), 16% by attribute "csp" (no idea what it is), all other attributes take less than 2% each. There're no "csp" attribute in my new (B) sessionstore.jsonlz4 and "image" attributes are "null". The first and second place are the "url" (23%) and "title" (19%) attributes respectively. I moved the new (B) sessionstore.jsonlz4 to the old profile and the problem was solved (the 4129 tabs limit disappeared). However, since the new (B) sessionstore.jsonlz4 has no "image" attribute data, all tabs are displayed without icons. I wrote a simple python-script that decompresses sessionstore files into json format, then copy "images" attributes of the old (A) sessionstore.json into the new one (C), and then compresses this into the new (C) sessionstore.jsonlz4. The size of such a compiled file is 6.82MB. When using such a sessionstore (С), the tab-icons are displayed, but the problem with the limit of 4129 tabs appears again. So it's obvious that the large size of the sessionstore.jsonlz4 file is the root of the problem.

My questions: 1) How do I fix it? Obviously, the "do not use more than 4129 tabs" option is not suitable for me. I know that most users will find this number of tabs excessive and suggest using bookmarks, but it doesn't work for me either. Spread tabs across multiple profiles or even browsers? I'm afraid that's what I'll end up having to do. 2) Why is this happening? I read people online who had sessionstore.jsonlz4 over 50MB and had no problems. 3) 67% of the space in my sessionstore-(A) is taken up by images, and many of them are repeated 100-300 times - a colossal waste. In total, I counted 792 unique images. Question - is there any way to modify sessionstore.jsonlz4 to significantly reduce its size, but still leave the data about these images? I tried to create 792 files with these images on my disk and replace the "image" attributes data with the path to these files. I tried the following options:

 "image": "D:/some_dir/123.ico"
 "image": "D:\\some_dir\\123.ico"
 "image": "file:///D:/some_dir/123.ico"
 "image": "file:///D:\\some_dir\\123.ico"

But it all doesn't work - the browser just replaces all these values with "null" after loading. In the original, such an attribute usually looks something like this:

 "image": "data:image/png;base64,iVBORw0KGAAAf8...(many bytes)...5ErkJggg=="
 or
 "image": "data:image/ico;base64,...

Any other ideas on how to replace those long data:image-strings?

I'm sorry for such a vague, long question, but I really need help from the experts.

CarthagoDelendaEst 於 1 年前 詢問

Paul 最近回覆 於 1 年前

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When video player is closed it creates a window that continues to play video

When visiting a website and launching a video it plays fine. When I decide that I have watched enough and close the video window it moves to the side and continues to pla… (閱讀更多)

When visiting a website and launching a video it plays fine. When I decide that I have watched enough and close the video window it moves to the side and continues to play. I have closed the video because I don't want to see or hear it any longer. This very annoying and I can't figure out how to prevent this from happening. Does anyone know how to disable this annoying behaviour? Firefox 94.0.1 64 bit Windows 10 Pro

kobostage 於 1 年前 詢問

kobostage 於 1 年前 解答

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Firefox has become very slow lately.

Firefox has become very slow for some two weeks om my desktop with Linux Xubuntu 18.04. Some sites can be approached without problems except for the speed, other sites ar… (閱讀更多)

Firefox has become very slow for some two weeks om my desktop with Linux Xubuntu 18.04. Some sites can be approached without problems except for the speed, other sites are opened after some time, but freeze so that scrolling and clicking on links won't work. I tried to find an answer in the Settings......

edschijf 於 5 個月前 詢問

edschijf 於 5 個月前 解答

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Windows 10: Alt-tabbing sometimes causes Firefox to freeze momentarily

As far as I can tell, this has something to do with Firefox aggressively offloading stuff from memory to storage. When I alt-tab at times, Firefox completely freezes. Eve… (閱讀更多)

As far as I can tell, this has something to do with Firefox aggressively offloading stuff from memory to storage. When I alt-tab at times, Firefox completely freezes. Every Firefox window hangs on a single image and I am unable to interact with anything for a few seconds. During these seconds, I can see the memory % in the Windows Task Manager slowly climbing until Firefox unfreezes itself, so it seems to be loading stuff back into memory. For example, it'll climb from 55% to 70%, taking its sweet sweet time. I also see some disk usage with 'System' during this time.

This behavior occurs even when I'm active on the browser and at 50% memory. It seems to occur more often once I hit the 60% memory mark.

I'm almost certain that this is a Firefox-specific issue, because I can interact with any other program during this period. It is only Firefox that stops dead in its track.

Is there a way to make this behavior less aggressive? I'd rather not have my alt-tabs freeze every few minutes.

Arcotash 於 2 個月前 詢問

Arcotash 於 1 個月前 解答

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Firefox crashes on start-up, even in safe mode

Hi, just as title describes, I'm unable to launch Firefox on my computer right now. I think the app MIGHT have automatically updated itself while I left it open overnight… (閱讀更多)

Hi, just as title describes, I'm unable to launch Firefox on my computer right now. I think the app MIGHT have automatically updated itself while I left it open overnight, but I'm not sure. All I know is, I'm unable to launch it after it crashed itself while I wasn't looking, and I don't want to factory-reset it because I have a ton of pages open and don't want to have to reopen them. What do I do?

Crash ID: bp-072b8eec-9024-4c7e-9723-ba6c20221008

(If there's any other information on my computer that I can go fetch to solve the issue, I can do so easily, just tell me)

Stellariux 於 1 個月前 詢問

Stellariux 於 1 個月前 解答

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Scrolling Is Delayed about 2 Seconds

I am using a Dell Inspiron 3847 with the standard keyboard which came the system years ago Recently, when viewing a large online page, when I try to scroll down, the scr… (閱讀更多)

I am using a Dell Inspiron 3847 with the standard keyboard which came the system years ago

Recently, when viewing a large online page, when I try to scroll down, the scroll doesn't start until about two seconds after I press my scroll key (which is the lower-middle key of the 4 keys between my right-hand "Ctrl" key and the "0" of the 10-key keyboard at the far right of the keyboard).

This delay started happening a few weeks ago. I do not know whether something I did caused it.

How can I scroll my view starting immediately, rather than having to wait two seconds for it to start?

jwill1000000 於 1 個月前 詢問

jwill1000000 於 1 個月前 解答

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Firefox just crapped out on me

Nothing will open. Not even settings. Just a blank page. Won't go to any web pages. I uninstalled and reinstalled, same thing. Almost like an update messed it up, but I l… (閱讀更多)

Nothing will open. Not even settings. Just a blank page. Won't go to any web pages. I uninstalled and reinstalled, same thing. Almost like an update messed it up, but I looked in Windows update and there were no recent updates. Microsoft Windows 10 Home.

Brock297 於 1 年前 詢問

jscher2000 - Support Volunteer 於 1 年前 解答

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last five crashes as requested by support Attention support

bp-022ab5a5-eb82-4d63-b468-2d31c0210310 3/10/2021, 11:57 AM View bp-0c379d15-b218-411a-a640-684450210308 3/8/2021, 4:16 PM View bp-1d855f39-f928-48cf-8652-484570210… (閱讀更多)

bp-022ab5a5-eb82-4d63-b468-2d31c0210310 3/10/2021, 11:57 AM View bp-0c379d15-b218-411a-a640-684450210308 3/8/2021, 4:16 PM View bp-1d855f39-f928-48cf-8652-484570210307 3/7/2021, 4:11 PM View bp-78bfe4fd-48a1-4ed0-a458-3bcae0210307 3/6/2021, 8:19 PM View bp-f88214ec-5aa3-4d37-9aef-a24630210306 3/6/2021, 12:35 PM View

wiseguy 於 1 年前 詢問

Paul 最近回覆 於 1 年前

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Web Applications are Distorted.

Whenever I use web-applications that use WebGL or anything similar, they are always distorted. And yes, I have tried disabling Performance Settings, but that only slightl… (閱讀更多)

Whenever I use web-applications that use WebGL or anything similar, they are always distorted. And yes, I have tried disabling Performance Settings, but that only slightly helped.

cromeydavid 於 6 個月前 詢問

cor-el 於 6 個月前 解答

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Latest Firefox Version Totally Broken!

Firefox has worked fine on my WinX systems for years. Yesterday it downloaded a new version (103.0 64-bit) that totally destroyed the experience! Everything I see now is … (閱讀更多)

Firefox has worked fine on my WinX systems for years. Yesterday it downloaded a new version (103.0 64-bit) that totally destroyed the experience!

Everything I see now is GIANT SIZED compared to the rest of my desktop and to the old Firefox. I've looked for any relevant setting and I've tried the "Refresh" button with no help.

I want to go back to the previous version!

Anan 於 4 個月前 詢問

jscher2000 - Support Volunteer 於 4 個月前 解答

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July 26 FF uprade turned my lighted keyboard off. I want it back.

FF upgraded itself and turned off the lighted keyboard on my tower computer. I can still use the keyboard, but it is not backlit and I want that feature back. Windows he… (閱讀更多)

FF upgraded itself and turned off the lighted keyboard on my tower computer. I can still use the keyboard, but it is not backlit and I want that feature back. Windows help files are non-existant. I have unpluged the keyboard and reconnected it and I did a cold reboot of the computer-no joy. Disabling the keyboard and trying to reinstall it by plugging it in again might work, but doing that is marked "advanced" by windows, so I am afraid to do it without advice. I am running windows 10 and use a Logitech keyboard. I am not a computer techi, so I need advice in baby-talk. VO1TV>

tturner125 於 4 個月前 詢問

jscher2000 - Support Volunteer 於 4 個月前 解答

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Sticking buttons and browser blinks on Solus, fresh start doesn't help

It periodically blinks and that breaks buttons that open menus and closes context menus from Firefox. Also disables some keys, the tested list is arrows, might need to te… (閱讀更多)

It periodically blinks and that breaks buttons that open menus and closes context menus from Firefox. Also disables some keys, the tested list is arrows, might need to test that on all. As it's version-independent, it might be a dependency issue. It also happens in safe mode, which is saddening.

TheK0tYaRa 於 4 個月前 詢問

TheK0tYaRa 於 4 個月前 解答

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Browser no longer allows me to log into my ISP's website

From time to time i need to log into my ISP's website portal, yet from today which is since the update yesterday) it will not allow me to it has my log in details saved c… (閱讀更多)

From time to time i need to log into my ISP's website portal, yet from today which is since the update yesterday) it will not allow me to it has my log in details saved correctly, but when i try to log in the sit it says they are incorrect, which they are not.

At first I thought the issue was with my ISP's website, so I was on the phone to them and together we tried crhome and edge and the log ins worked just fine, but not with the Firefox browser.

So sadly either something you changed in that update seems to be messing with the log in on this site and possibly others or possibly one of the add ons I use with it together with the browser is now causing an issue and is interferring I wouldn't have the first clue.

Mark397 於 2 個月前 詢問

Mark397 於 2 個月前 解答

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Audio stops when monitor turns off and on

So this problem is isolated with Firefox as it doesn't happen with Edge or VLC on this pc. If I have Twitch or Youtube, probably any other audio or video playing, open wh… (閱讀更多)

So this problem is isolated with Firefox as it doesn't happen with Edge or VLC on this pc. If I have Twitch or Youtube, probably any other audio or video playing, open when I turn the monitor off the audio will no longer go through properly when it is turned back on. The video is still playing fine but the audio isn't going through properly. Refreshing the page fixes the issue.

I have made sure to disable all other audio outputs and defaulted the current HDMI output. Audio playback works fine on every other application that I have tried.

Running Windows 11.

joshs1331 於 2 個月前 詢問

joshs1331 於 2 個月前 解答