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Mozilla Firefox is very slow and even difficult to open.....I am using this browser since ten years and never had any problem....Please do the needful at your earliest...Thank a lot....RASIK MER

Hello,

does anyone observe an issue that Thunderbird [140.4.0esr (aarch64) / macOS 26.0.1 (25A362)] freezes for 5 seconds after sending an e-mail? This is super annoying...

Marcin

Hello, dear Mozilla support team :).

I have a question that has to do with the ever growing memory usage. I just found out the about:memory page in Firefox, which allows the users to manually free up the system memory by clicking the "Minimize memory usage" button. This is great and it does its job well, however for many years I've wondered why doesn't the browser clean up the memory taken by web pages like Twitch, Kick, Youtube, etc., which take a lot of memory, especially when people leave them open for hours, then when they close the tabs, the memory stays buffered until the browser has been completely closed.

The "Minimize memory usage" button does clean up the memory, so won't it be possible to implement such functionality that can be enabled/disabled somewhere in Settings, to allow the users to choose the browser to unload all memory taken by any tab when they close the tab, but not the whole browser?

This will help a lot, because I personally leave my PC and browser open for days, and sometimes I have to either close and re-open it, or go to about:memory and do a "Minimize memory usage" to free up the memory, that was taken few days ago by a single Twitch stream tab or some other tab, and the information in this buffer is absolutely pointless, but it sometimes takes all of my 96GB of RAM.

Thank you for any information on the subject :).

All the best, Borislav.

The folder 'Outbox on Local Folders' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again.

It's hard to pin down when exactly it will happen but Thunderbird regularly freezes from roughly 10~15 seconds after clicking the red close button. In that time TB doesn't allow the desktop or any other app to become active until it finishes whatever it's doing. The bug occurs after I've brought it to the front and then close it. For example, an email just arrived so I checked that then closed TB. That's when it hung.

I've found it also happens after discarding a draft so that I'm unable to open or even highlight other emails in my Inbox for a short time. This hanging started happening right after I upgraded to Mac OS X 26.2 a few weeks ago. So far I've tried...

1) Troubleshoot Mode. No change. Even with no extensions or themes installed the problem shows up. 2) Increased the value of mail.db.idle_limit 10X to 3000000. 3) Did a clean reinstall of the app (v146.0.1). I redid Settings from scratch and imported emails from a previous installation. The size of the Profiles folder is 991MB. 4) no anti-virus software is installed.

It's similar to this bug. I made a comment there 2-3 weeks ago but no reply so far. https://bugzilla.mozilla.org/show_bug.cgi?id=1998881

Also similar to this... But I don't have a calendar installed. https://bugzilla.mozilla.org/show_bug.cgi?id=2000460

Not sure what else to try. Any suggestions?

i am trying to type this message on firefox, but i have to avoid shift key not to interrupt typing. when i hot shift+some other keys like i, b, v, etc, devtools pop up. i have checked other forums, other q&a on firefox support, and concluded that the same issue have occurred to many users regardless of the os, features, extensions, various keyboards (but not the virtual one for me) or system settings. i have to type a lot in the browser, so i just choose to delete firefox until someday the issue is fixed.

When my laptop is connect to a monitor via HDMI cable, the resolution on Firefox switches between what my laptop is at when not plugged in and the current monitor's resolution. It almost looks like Firefox is hiccuping between resolutions. This last for a few seconds and happens frequently within the hour. How can I stop Firefox from being confused about the resolution it's supposed to be at?

BLUFF:

1. Long start up times (do not see this on other browsers) 2. FIrefox often crashes. Browser tells me that a report has been sent. To where? No response. 3. How do I check if my browser is up to date?

What could be causing this? What are my effective actions to increase performance?

System Summary is below:

OS Name Microsoft Windows 11 Home Version 10.0.26200 Build 26200 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Name DESKTOP-JK3NIOU System Manufacturer HP System Model HP ENVY TE01-1xxx System Type x64-based PC System SKU 13Z31AA#ABA Processor Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz, 2904 Mhz, 8 Core(s), 16 Logical Processor(s) BIOS Version/Date AMI F.40, 7/29/2021 SMBIOS Version 3.2 Embedded Controller Version 88.20 BIOS Mode UEFI BaseBoard Manufacturer HP BaseBoard Product 8767 BaseBoard Version A (SMVB) Platform Role Desktop Secure Boot State On PCR7 Configuration Elevation Required to View Windows Directory C:\WINDOWS System Directory C:\WINDOWS\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "10.0.26100.1" User Name DESKTOP-JK3NIOU\Owner Time Zone Central Standard Time Installed Physical Memory (RAM) 16.0 GB Total Physical Memory 15.8 GB Available Physical Memory 9.63 GB Total Virtual Memory 51.8 GB Available Virtual Memory 42.0 GB Page File Space 36.0 GB Page File C:\pagefile.sys Kernel DMA Protection On Virtualization-based security Running Virtualization-based security Required Security Properties Virtualization-based security Available Security Properties Base Virtualization Support, Secure Boot, DMA Protection, UEFI Code Readonly, SMM Security Mitigations 1.0, Mode Based Execution Control, APIC Virtualization Virtualization-based security Services Configured Hypervisor enforced Code Integrity Virtualization-based security Services Running Hypervisor enforced Code Integrity App Control for Business policy Enforced App Control for Business user mode policy Off

I use the Unified Inbox feature and generally keep the Unread filter on unless I'm looking or searching for a specific message. Opening the app or reloading the Inbox takes up to 15-sec to go from a blank screen to showing the messages. I do have all the inboxes indexed on the device but the issue was observed with the standard 25 message limit as well. I have not had similar delays or have been met with a blank screen every time an email app is opened. Is there an ability to speed up the initial and subsequent loading times? It does hamper workflows and skews the perception of the app towards being inefficient or otherwise less than capable compared to similar apps.

when i sign on to my computer, frequently a prompt will appear that says i have to close the old firefox. sometimes i have to close it 5 or more times before i finally get connected to the internet. what can i do? im 83 and not tech savvy. also, when i sign on-the site crashes a lot and i should restart firefox and send a report in.

This version is very slow when opened ... it seaches through for various emails (gmail and Outlook) and snags on something called 'Checking Mail Server Capabilities'. Other issues include a slow copy to the Send folder once an email has been sent. I am not a technical person, been using TBird for many years and until now have really enjoyed its capabilities

Is there a known related issue? Overall the performance is very poor ... I use a series 7 processor and have WiFi speeds in excess of 100 MB.

Thanks Ron

There's a well known "window-focus bug" in MacOS 26, where clicking on a window (even the title bar) doesn’t bring that app to the front. It seems like Thunderbird is particularly susceptible to this bug, and I was kind of tolerating it in 26.1. But just today I updated to 26.2, and oddly this has made the problem worse. Is anybody else seeing this and is anybody aware of a fix? Various MacOS discussion groups recommend tweaking MacOS mission control settings, but I don't use mission control at all.

I have had a dual boot Windows 10/Ubuntu Linux set up for many years, with Firefox installations in the two operating systems both using the same profile accessible on a shared a disk partition. Since a Ubuntu update several months ago, using Firefox under Ubuntu produces the "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." problem when I revert to Windows and try to run Firefox under Windows. I can clear the problem by running a disk check in Windows on the shared partition, but does anyone know how to avoid this?