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After every update, Firefox starts to a blank screen and will not start loading the webpage url put in for over twenty minutes to a half hour. During this time other browsers on my Win 10 PC load immediately so it is not a network issue. It is Firefox. When I see that an update is pending I hesitate to do the update because I know I will lose the use of Firefox until it is ready to respond. It just hangs with "loading X.com" showing at the bottom left of the blank screen. I have been using Firefox for a long time and in the past year or longer it has become very unreliable. There are also instances where without an update it will do this and the only way I can get it to work is to clear the cache and the history through settings. What is going on with Firefox! (And lately there is an update every couple fo days!

I have a fresh install of ubuntu 24.04.3,... on my AMD 'go-faster' PC. S/w all up to date,.. and snaps up to date. In my pursuit of migrating TB email from one m/c to another,... nothing works,.. least of all the TB i/f. My TB screen looks as follows:- with only a few seconds in-between shots. This 'font' type issue is my primary problem,.. and is consistent even if a create a 'new profile',.. emails are display still with funny fonts, ( which change as my mouse moves over them ). secondary issue is in copying over my '.thunder' folder structure, from one m/c to new one,.. is TB insists on creating new profile,.. as it reports profile is outdated,.. yet as far as I can see both are running TB 140.2.0esr 64 bit. I have tried several clean installs,.. but results 'seem' to be the same. Does anyone have any ideas...

Am getting this message along with a recurring download of a specific email (keeps coming back even after deletion) that does not allow any other new messages to be downloaded. I do see new emails on my phone but will not read into Thunderbird??

Error: "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox."

Tried: Troubleshooting, closing Thunberbird and reopening, rebooting windows system, compacting, etc. to no avail....

Have always set up accounts so they download all messages to hard drive.

Since 3/27/25, it is as if it never officially logs the downloads as downloaded, so it downloads each day as if it hasn't been done since 3/27/25, marking all of the messages since then as new.

File is very large so want to try fixing without deleting entire file.

Tried the 'repair this folder' but that didn't work.

Having trouble identifying the exact folder on the hard drive to delete since there are several different accounts in the Thunderbird setup.

Youtube just does not run well on the firefox browser, I have had this issue on my pc, as well as my laptop. Twitch, piracy streaming sites, 9anime all work fine this problem with loading and buffering is exclusive to youtube. I have tried resetting my firefox settings, changing the values for load times and resource usage in about:config and none of these have fixed my youtube.I have tried multiple fixes I've been recommenced by online forms. I have switched my user agent to make youtube think I am using chrome, I have disabled and removed all of my extensions including ublock origin, and loading youtube remains painfully slow. In fact, disabling adblock makes the load times even slower.

Also responding to my post with "hmmm durrr it works just fine for me" does not help anybody, stfu.

I've loved Firefox for years but can no longer use it because I have been unable to resolve this issue. All was well, an update was done, and bingo, I got this message. I don't know how to fix it. I removed Firefox from my desktop and re-installed. Same problem.

"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."

Why Thunderdird now is so slow

Why you recommend to upgrade to ESR when the one that I had been using for years I don't trusted

I have Thunderbird: 128.10.1esr (64-bit)

Amparo

This has happened the last two times I've tried to write a reply. I will be writing along and all of a sudden the screen dims and I get the blue circle thingy. Thunderbird locks up and doesn't come back but the red exit button is available. Of course, I lose all the reply I've written. I've never run into this error before and I've been using Thunderbird for years. I'm running v. 139.0.2 (64-bit) on a win-11 laptop, Firefox in the background but no other programs running. I clear my cache at the beginning of every month, so I did that this morning before starting any programs.

Thunderbird 138/139, Windows 11 Pro 23H2. While composing a message, after a few lines the app freezes. Both the compose window and the main TB window freeze. Only opening the Windows Task manager allows me to close them. This did not happen with earlier versions.

If I save the message every few seconds while composing I can get most of the message back and continue after restarting TB. This behavior is the same in both the normal and troubleshooting TB modes. I can't even find a crash log to send to Mozilla.

Where shall I look next?

Thank you!

in inbox suddenly some mails became empty and cannot be deleted nor moved nor archived, other messages not affected. It happened earlier and was asked to delete the inbox folder, that worked. But again same problem happening on the same email account, other accounts no problem. See screenshot, the bad ones have red star. Clicking on bad ones: empty screen. MacBook Pro latest OS and software

I am now getting a spinning wheel with annoying frequency while using/trying to use Thunderbird on my MacBook Air 2017 running Monterey. Everything was fine for the first 6-9 months, but over recent months the spinning wheel has appeared more and more frequently while I'm trying to read mail, answer mail, scroll through messages, etc., etc. Now it comes up every few minutes and delays me doing anything for about 15-30 seconds at a time. It's really frustrating. I recently ran Onyx, which was designed to clear cache, etc and make everything run smoothly. But the only program it required me to quit before it started was Thunderbird. Is there some cache or something I need to clear on a (semi-) regular basis to keep it working at a reasonable speed without this godforsaken spinning wheel interrupting everything? Thanks for any/all your help.

Recently when I download messages they are blank in the inbox, but when opened they are in source code! This happens with all accounts. It was working correctly up until 7th August. The only update since then was for .net! I'm running latest Windows 11. When I uninstall, then reinstall Thunderbird, initially any messages download correctly, but any further downloads revert back to the problem in question. Any help would be appreciated. Thanks Ray

Since recently 1~2 version, my Firefox keeps consume large amount of memory and release it repeatedly

Even I restart Firefox and do nothing, it will start doing this again

I use about:processes and about:memory to capture this seems the main process's "tab.query" causing this, please check

PS: sometime it will consume till system max (64GB) and cause my OS out of memory. PS2: that wave-like memory usage is cause by Firefox

I'm using the vertical tabs feature. I also tried enabling the "Expand sidebar on hover" option, which minimizes the side bar, and only expands it when you hover on it.

Issue: I have a lot of open tabs, and I'm usually working with the ones at the bottom of the list. When the bar minimizes the scroll position resets back to the beginning. So, every time I want to select a tab, I have to scroll back down, which makes this feature very hard to use.

Expected behavior: After the vertical bar minimizes, and I hover again, it should keep the scroll position.

reinstalled Thunderbird 140.0.1esr (64-bit). When I attempt to Write a new email: gibberish shows p in the text body. Canot overwrite; have deleted previous version and reinstalled current one; followed trouble shooting steps in Safe mode without change. This doe not ocur in my Android devices. It appears in each of the two email accounts I have running in Thunderbird, 1) gmail, and 2) email account from my business website. I have been a Thunderbird user for 10+ years, and have not encountered this before. any assistance is appreciated! TYIA!

One of my TB accounts has two archive folders, one named Archive and one named Archives. The Archive folder has nothing in it while the Archives folder has several years of messages in it. How can I delete the non-functional Archive folder?

install on Dell studio 1555 8 gb ram running widows 64 bit windows 10 home solid state drive

Unable to send any emails although all the server settings are correct have the attached dialogue box come up see screenshot. suspect this is not directly a prob with Thunderbird as was having problems with some undelivered email with outlook.

any ideas recive mail is fine

thanks Chris G