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Trying to change the color of the unread background and the top header bar. Got the unread message color change to work.

But if I try to change something else, it doesnt work. I dont know how to combine these codes properly.

thunderbird 142 or latest. windows.

Thunderbird 128.14.0esr on Debian 13 KDE. Email is in Classic View.

The mail headers take up far too much space.

Here's an example of the problem: http://map.atownsend.org.uk/tmp/Screenshot_20250829_150825_2.png . As you can see, about 50% of the UI is taken up by headers. I like the general layout (tree at the left, not included in screenshot, list of messages above and the message itself below) and I like the contents of the headers (I don't want to display fewer; I'd just like them to take up less space).

Changing the font via edit / settings / font / size has no effect on the headers (it may be changing the size of the text within the message, but I can't really see enough of that to be sure).

How do I change the font within the headers to a different, smaller, value?

Starting last night, Thunderbird 140.2.0esr has trouble connecting to Comcast email servers. In my case, I am getting an error that the connection was reset. Sometimes, if I close TB and re-open, it will connect for a bit and download new mail, but later fail. This is using the POP3 servers. On the Comcast forums, others are reporting similar issues. https://forums.xfinity.com/conversations/email/unable-to-connect-to-pop3-server-this-morning/68af0959e127b572a1266228

I don't have TB on my Android phone, but Outlook is also having issues with forcing me to sign in, and that can take 2-3 tries, and will . The Yahoo Mail and FairEmail apps do work on the phone without problems. These all use the IMAP servers.

Hi, is there a way to customize sidebar to move the controls to the top or bottom of the sidebar? With sidebar open there is a lot of wasted space with just 3 icons - settings, history and sideberry buttons. Not really an optimal situation.

Attached screenshot and another picture explaining where I would like to move the buttons. Either top or bottom of the sidebar is preferable than taking the side.

While using an opened tab which I want to keep in place, I find it frustrating that if I want to click on one of my bookmarks in my toolbar, it uses the tab I am currently in which, of course disappears and is overridden with my selection of a bookmark. Is there a setting for me to change how my choosing of a bookmark reacts? I want it to open in a new tab and not on the one I am working with. I have looked everywhere and I cannot find a setting for this.

Before I updated to 142.0.1 when I had a tab group and closed it by clicking on it, all the tabs collapsed into the tab group tab and the only thing I could see was the tab group title tab. This was awesome! I started using it immediately and loved it. Since I updated the tab groups still work, but now, sometimes, when I click on the tab group tab to close the group I see the title tab, one of the tabs included in the group, and a "+2" or however many tabs are hidden. This pretty much defeats the whole idea of having the tab groups in the first place, which to me, was to hide ALL THE TABS under ONE tab to clean up my work area.

The image below shows an example. Note the "eBay" tab group is closed, and yet it shows the tab group tab (eBay), a tab in that group (eBay icon and "Order" with the X to close the tab), and then "+2" meaning there are two hidden tabs. In contrast, the "Simple" and "Web Work" tab groups are also closed and contain 4 and 9 tabs respectively, all neatly tucked under the one tag group tab for each group.

Why is this happening only on some tab groups, and only some of the time? How can I stop this from happening?

i AM SICK OF THIS. eVERYTHING i HAVE ALREADY IS PROTECTED. i DO NOT NEED fIREFOX BLOCKING ME OR SENDING MESSAGES TO A PHONE THAT IS DOWNSTAIRS. do YOU KNOW HOW IRRITATING THIS> i GUESS IT IS TIME TO FIRE YOU AND FIND ANOTHER BROWSER THAT IS NOT DISRUPTING MY LIFE.

This is second request (can't find the first). I need to import multiple (bookoo) .EML files into TB 115.10 to later move into "folders". Several weeks ago I somehow found someway to import a single .EML file (downloaded from an old ISP) into TB -- and then got busy with other projects -- and now cannot figure how I did it. I did not use an extension (ImportExportTools NG) -- just the native tools in TB 115.10. If anyone is familiar with importing EML files -- sure would appreciate suggestions. Thanks.

I want to change the name of my Firefox extension from "eBird reviewer utilities" to "eBird reviewer assistant". I thought that it would be sufficient simply to change the name in the manifest:

 "name": "eBird reviewer utilities",
 "version": "1.3.46",

to

 "name": "eBird reviewer assistant",
 "version": "1.3.47",

(This was sufficient for Chrome.)

Firefox on my Windows 11 laptop processed this exactly as I expected, picking up the new version and new name. However, Firefox on my Windows 11 desktop does not recognize that there is an update, it only says no updates available. Likewise, Firefox on my Android phone has not picked up the update.

I noticed that the name on the product page was still the old one, so I tried renaming it there, and bumping to version to 1.3.47.1. On the Developer Hub, the extension is correctly listed with the new name and version (see attached screenshot)

However, my desktop running at 1.3.46 still says "No updates found". (See second attached screenshot)

So my first question is, is the confusion related to the attempted name change? And secondly, regardless of the reason, how do get the update recognized?

Duplicate account setup on 2 pcs. One works great. The other I had to delete and reinstall Tbird. It still refuses the account. The reinstall was performed 3 times. Same results. Thoughts?

When I try to create a new presentation in PowerPoint I get the message that the browser is not compatible. When I click for support it says it should be compatible. Running Windows 10. PPT and Firefox are up to date.

Good morning, I'm running Firefox Developer Edition 143.0b6 on Linux Mint 22.1. A couple of weeks ago I noticed that when moving tabs on the left-hand side they'll instantly get locked into an inscrutable and seemingly impossible to fix "pinned mode". Is there a way to turn this off? It is driving me crazy. I've looked through Settings > General > Tabs and about:config and didn't see anything relevant. If anyone has run into this or knows a workaround, I’d be grateful to hear it.

Why do they keep moving or removing this functionality? I can’t figure out how to send a tab to another device. There’s no option anymore on the “…” menu and I don’t see where else it could be.

Does anyone know how to do this on the new version of the iOS app?

Why does my Thunderbird email account not sync with my Ionos.co.uk IMAP account - some of the inbox folders are missing.