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i have two computers. on computer 1, all is fine. on computer 2, when it restarted after an update, i got the error message -- "the bookmarks and history system will not be functional b/c one of firefox's files is in use by another application, some security software can cause this problem." this has NEVER happened before.

i found the "how to fix this problem" page, but i am completely baffled by it. what i want to know is what security software (i have avast apps) is likely to have caused this problem, and how do i fix it (i.e., what setting should i change?).

thanks for any help you can provide. i am NOT tech-savvy, this is the only time this has happened, and i've had both computers for years. they have both always had the same apps.

I'm looking for the DOM for the currently selected folder. I'd like to alter the style of the border and remove the annoying vertical bar on the left. If anyone can provide the CSS selectors I'd be grateful.

Also, if someone can point me in the direction of how to find this information for myself, that would also be cool.

Thanks in advance!

Hello. How do I do if I want Firefox to open a new window every time I click on the icon? I tried to insert the command "-new-window URL", which used to work before but it doesn´t anymore. Is there anybody out there who knows something about this?

i have a half dozen personal group address books in thunderbird but cannot find out how to enter a new one. i spent a lot of time with my menu (tools, files, etc.) and could find nothing related to setting up a new group file. Please help...

I had to reinstall Thunderbird after a crash. Before, my inbox was split in two. The top half was the messages and the bottom half a preview of the selected message. Now I just have one long list of emails. Please can you advise how to go back to the split screen view. Many thanks.

Hello,

Since some days ago, my Kaspersky antivirus has detected trojans from emails of January 2021. It seems like Thunderbird saves a backup from old emails on our system, and these emails contain spam and trojans.

See attached image. All of our computers show same issue. And it happens with more than 50 old emails. Also I have attached the path of these emails, where the issue has been detected by Kaspersky.

How can I remove these old emails and configure Thunderbird not to save old emails backups?

Best regards, Alba

Hi

I use Thunderbird on Windows (now 11) for 16 years now. Currently I have Thunderbird version 128.1.1. I would like to share profile between Windows and Linux (Ubuntu 24.04) installations on same machine. Profile folder is in a ntfs partition accessible both from Ubuntu (automatically mounted) and Windows. I managed to edit profile.ini file to point to right profile folder. On Windows evenrything workes fine. When I try to open Thunderbird in Ubuntu I get empty folder list and no account information in configuration. In the profile folder there ale many files created with names ending with corrupted are created (like folderTree.json.XXX.corrupt). Another try to open Thunderbird ends with message that profile is already in use. Any advice? Maybe I should debug starting Thunderbird (if yes let me know how to do that).

Thanks in advance. Marcin

I am trying to change the setting for default apps and it is grayed out (can't change it). This is the only app that I can't change and I want to know why. Redmi note 8 pro, android 11. (Sorry if this is not the right place or it has been asked before, it is my first time needing support)

I would like Firefox to save my usernames for sites, but not the passwords. However, Firefox insists that I supply a password before it will save the account details, and if I supply a dummy password, then it will not let me later edit the account and delete the password. I like to remember my own passwords rather than store them anywhere.

I have tried password managers and they are overbearingly controlling, particularly given that they don't store my passwords let alone my 2FA details, so I'd rather just use Firefox's less onerous, built-in system, if only it would allow me to save an account without a password. Surely saving a username without a password is a safe option, so why block it?

On your latest email you show a dark blue colour side bar (https://www.thunderbird.net/en-US/thunderbird/128.0/whatsnew/?locale=en-US&version=128.1.1&channel=esr&oldversion=115.14.0 However I am unable to change the colour of the side bar. It keeps the old light gray colour. (See attachment) I tried to change it with a "Right-Click" on the side bar and change the colour but nothing seems to change. How do I do this? Thank you :)

Hi. I cannot use stripe payments. I am using FF vLatest and have added it to the popup blocker exception list and every other exception list I can find. I have done this for http://stripe.com and for whatever website is trying to use stripe. No stripe payments ever work and I always get the same error attached. I have tried another browser and it works. How can I find out at least what is blocking the payments so I can disable it?

I have 2 laptops, one for work and one personally. I was looking to set-up firefox on my personal laptop as well but noticed I cannot open developer console on a specific element by pressing 'q' anymore after right clicking.

This is a significant feature and I would like to keep using it. Is it possible to enable this feature on my personal computer as well? Since it is still enabled on my work device.

I use Greek letters Omega (Ω) and mu (μ) in electronics discussion, where the Greek Omega (Ω) is the symbol for "ohms" of electrical resistance to the flow of current, and Greek mu (μ) stands in for "micro" or millionths of an ampere of current (1μA is 1/1000,000th of an ampere of current flow).

I sent an email to others and my email account on which I use Thunderbird Mail (version 115.13.0 on Linux Mint). I artfully spelled in all caps the word "Communicator," using the Ω sign in the place of "O" and the μ sign in the place of a "U." I received the word with this spelling: "C?MM?NICATOR"

Checking in Firefox on my Gmail account's Sent folder, I found the Greek letters in good order. Firefox can use UTF-8 encoding.

I found a solved thread on the Stack Exchange. Look under Tools • Options, as it is in Windows, but in Linux that's Edit • Preferences • Display. I have neither Options nor Preferences in this version of Thunderbird, nor can I find anything about setting encoding in Edit • Settings. I should set encoding from Western to UTF-8 on both incoming and outgoing mail to see foreign characters.

Some info about my installations of Firefox and Thunderbird here: In order to not lose my profile when I need to reinstall Linux for whatever reason, I have both Profiles stored on an outboard disk that is treated as a permanent disk on the system. This move also gives the profiles room to expand as needed

Linux Mint 21.3 Cinnamon 64-bit MintBox Mini 2 Pro by CompuLab No longer on Amazon, but info here at the Linux Mint store .

So I ask, "Where to from here?"

bold textstarting/wanting to use Java. Java is loaded but I am having issues starting to use it. I have Java loaded and installed but ho to starting to use ????

I've installed firefox with pacman on Linux, and I installed arkenfox. It did not work, I tried other user.js', none worked. I've also tried wiping my entire firefox root folder, then using arkenfox, but did not work.