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I have reinstalled Firefox on my Mac many times, completely removed all files using app cleaner, and reset Firefox by holding shift and option on start. Despite this, the app is very slow to launch, and when it does no pages load or render. Opening a new tab freezes the entire app for 15-30 seconds, and when the tab opens it is completely blank. Attempting to browse to a URL does nothing, and the address bar just returns to being empty. Attempting to open settings does nothing, although parts of the app that open separate windows such as the about version info and bookmarks work fine. The only thing I haven't done at this point is completely reinstalling macOS, so maybe there is something wrong with my system config. I first noticed this issue when using the early macOS Sequoia betas, and assumed the app wasn't updated to support it yet. However after updating macOS and completely removing and reinstalling all traces of Firefox, it still doesn't work. I am currently using macOS 15.1 beta, however the issue also persisted on 15.0.

The app can be opened and used, but it has to load for about 2 minuter between each input. The error first appeared after the 7th August update. When I try and click on the app, it starts using about 125 MB of RAM memory and the "Not responding" text appears.

I'm having issues with my Thunderbird. Although it has to check for new mail periodically it does not notify me on new email and do not show it in a mailbox until I hit "Get messages" button. And even after that I have to wait for several seconds. There's clearly something wrong but I cannot find what because I cannot find a connection log. Now I have to rely on mail notification daemon to tell me when I must open my Thunderbird and hit the button (to be clear I never exit T, it always runs minimized).

Recently I had a hard time trying to add Zoho account to T. It just didn't work no matter what settings I tried. Eventually I installed Claws Mail and found the root cause in the server response message. Unfortunately this method isn't applicable for the problem I described before - Claws logs can't tell my why Thunderbird doesn't check my mail when it has to.

So, is it possible to add connection log to Thunderbird (I can duplicate this to GitHub issue if necessary)? Or maybe there is one and I just didn't find it somehow (I know about devtool console - it's useless in this case)?

im not very good with tech so ive probably clicked the wrong things, but i cant use my firefox at all anymore. only to search up 'google.com' lol. it opens on the homescreen, but when i want to search anything it always comes out on the screen in the image included. ive been using firefox for a year or so and never had issues. ive tried deleting and reinstalling, restarting my laptop, the whole deal. im on windows 10 but that shouldnt be the issue i imagine. ive asked some friends and they dont understand it either. id love to get some help otherwise i might have to go back to google chrome D:

A couple of months ago Thunderbird started being very slow in multiple situations. I use POP3 and download all mails. I have fairly big mailboxes, some of them up to 2½ GB.

1) Downloading e-mails is slow.

But the worst is this one:

2) Clicking on unread mails first time. This can easily take 10 secs, where the app goes "not responding" and finally "Loading message...." With 10 new mails, it is a lot of wasted time.

3) Dragging mails from one mailbox to another Some of the same behaviour as above.

I have tried to compact mailboxes, but that doesn't help.

I am on release 128.4.1esr (32-bit), windows 10.

Recently starting having the issue where some whites and the tab icons appear washed out and even glitched out and pink when using my PC. I haven't made any significant changes to my system as far as I recall.

Colours in other browsers and applications are effected. Going to the same webpage on both Brave and Edge shows the whites correctly. On all the games on my PC there are no glitches in colours.

I have tried a few fixes already: -Removing and re-downloading GPU drivers - Fixes the issue temporarily. After about 1 day the issue comes back. -Re-seating the GPU - No fix. -Turning off colour override in Firefox - No fix. -Uninstalling and reinstalling Firefox - No fix.

If anyone has an idea or knows the setting that may be causing this problem I would really appreciate it.

System: Linux/Fedora41 Firefox: 136.0.4 Monitor: Acer 27" 1920x1080

When I open a FF window, it opens full screen vertically and to some width horizontally, both dimensions not desired. My usual style (for the MANY years I have used FF and Linux) is to use a FF window that is NOT full screen in either dimension since I normally have multiple windows open simultaneously. This FF behavior has started just recently.

This behavior occurs when starting FF from the FF icon on the desktop, when opening a new window from the FF main menu, or when opening a new window via the 'Open Link in New Window". (Perhaps other ways as well: these are those I encountered.)

I have tried: .... Opening FF/resize window to desired size/close FF using 'Quit': no change on restart .... Deleting the xulstore.json in the profile folder/restarting FF: no change on restart

I would like to restore FF to its previous action: open new windows at the same size as the last one referenced. Can someone help?

Thanks.

Bill Lee

duplicate of /questions/1476458 thread]

This happened too much, like 6 times when using firefox in this month. I dont want to shut the program because I got unsaved notes in it. I was listening to music and it just began to play it non stop. and it dont respond.

please help, a million thanks!

I try to restart network or suspend the process nothing works. If I could make firefox reopen to it's original state+ cookies; no site reloaded and get back my incogico it would be much appreaciated. ALso everything was saved in firefox since I did not end the task, I dont want to lose those.

The problem is that the 'Show Folder Size' option gives contents (even when no emails are present) that are too large. The file sizes seem to accumulate each time an email passes through the folder.

This was raised 8 months ago in a thread and the solution was to manually delete files in the Profile folder. This still works (I've just done it this afternoon) although personalised folders have to be deleted and re-made.

Has an easier solution been discovered, yet? Thanks...

Multi-Account Tab is on longer loading. I uninstalled it, shutdown my computer, and restarted it, reloaded it back on. Unfortunately, it's still not working. I do have Tab Stash on my computer as well, and it not working either. I guess the two problems are related, but I thought I would start with Multi-Account because I didn't want to lose all my bookmarks.

Does anyone have any thoughts on how it fit this?

Thanks,

duplicate of /questions/1471321 thread

Hello!

A very important email folder in my Thunderbird just vanished. I didn't touch anything! My email was downloading very slowly and so I closed the entire Thunderbird application. When I re-opened it, the folder was gone. Everything else is there as before - all other folders, my inbox etc.

I have no idea what happened or where the folder went. I can't find anything online that addresses the problem or how to solve it. I'm very much a tech novice. I need a solution that a 5 year old could navigate lol

S.O.S. Cara

Good day,

Since few days I observed that not all emails are received in thunderbind. Some e-mails received some not. I have comparision with other app on the phone where I see all e-mails. Do you know what may be wrong?

Version: 128.8.1esr Installed 28.03.2025 ID compilation 20250317192722 Kanał aktualizacji esr Identyfikator programu Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Thunderbird/128.8.1 System operacyjny Windows_NT 10.0 19045

How do I change the scroll bar width in Thunderbird? I can change the width in W11, but it has no effect in Thunderbird. I am using Thunderbird version 128.8.1esr 64 bit.

Thank you

On my Windows 7 machine, I am running Firefox V115.17.0esr (64 bit). When using Task Manager yesterday, I noticed the process spNMHost.exe whose description reads "Autofill Engine host for Chromium-based web browsers", but this process is started by Firefox (and ends when Firefox closes).

What the heck is going on?

https://addons.thunderbird.net

The addons website for Thunderbird appears to be down with a 502 bad gateway error.

Thank you for your time.

Zach

I have accounts from Outlook Mail through GoDaddy and Gmail on my Thunderbird desktop app. After the update on 9/17/24 I am unable to send from any of my 3 accounts. Please help.

Recently, every time I turn on email on Yahoo, I get a noisy notification when each email is received. I do not want or like it. It is annoying. How can I turn off the notifications?

I am having a continuing problem using fire fox to access websites. I go to a site to use one of their tools and have issues using or logging in to their site. I will go to a site where an accept cookies banner should pop up to continue and nothing pops up so I can't continue. I have tried the disable Enhanced Protection with no change in results. If I use Duck Duck Go, or Edge everything works. Firefox is my default browser, but it appears that you have made a change that is now impacting my ability to use websites. Sometimes things work if I go into Troubleshooting mode, but I can't determine where the problem is. I use Norton as my anti-virus and internet security and have turned it off as part of my troubleshooting but that does not help.

Please provide guidance.

Thank you.