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I have a very good PC (5800X3D, 7900XT, 32GB DDR4 3600), but Firefox (either the normal, canary and nightly version) can't play smoothly any 4K video (like the Borderlands trailer: https://www.youtube.com/watch?v=lU_NKNZljoQ ). 1440 and lower resolutions are fine, as are 4K videos on Chrome and Edge. FWIW, my CPU during 4K playback is barely used (1-2%), and my GPU's video codec (VCE) is used by around a third. Disabling HW accel makes things better, as it still stutters but it's (barely) passable. I already tried creating a new profile, but still it's the same.

basically just the title. In the last couple days youtube.com specifically has been borderline unusable for me on firefox. All other websites work fine for me on firesfox and youtube has no issues on other browsers.

The default attribution line created by Thunderbird when replying doesn't work well when sending e-mail to Outlook users. [Unfortunately, Outlook users comprise 100% of the people to whom I send emails in TB.] TB's default attribution line causes Outlook OWA to hide the entire reply from the reader unless they click on a [...] button to show it. Then when displayed, the entire message is quoted/indented.

Yes, this is a bug in Outlook. No, it's not going to get fixed.

This can be avoided by changing the attribution line which current defaults to:

       On <date> <time>, <name> wrote:

Simply adding a space after the colon at the end of the line "fixes" the problem, but it's annoying to have to do that manually.

Can that attribution line be configured somewhere?

I've found all sorts of addons that let you muck with the headers of replies, but the headers are fine. It's just the attribution line that needs to be fixed.

TSO Host migrated all my email accounts to a different server. All my emails have stopped downloading to Thunderbird. I cannot find a way to configure my TSO Host email accounts since they upgraded their servers to Cpanel deluxe yesterday and neither can anyone at TSO Host.

I would like to set up an email account with a pen name that I am using as an author. Is there a way to do that without giving my actual credentials? Thanks for your kind attention.

Android 14, One UI 6.0, Samsung S22+

Firefox is using a large amount of battery while idle. You can see my app runs open a lot of the day, but not in use much. It has drained 20 percent of one days battery, and I am watching YouTube videos on another app (Grayjay btw check it out!) and it has used far less battery. If I set Firefox into a sleeping state, the app still drains a lot of battery. When in deep sleep,it stops draining as much power, but then Android keeps auto pushing their own browser to be my primary browser. I'm not sure what to do in this case, as it's too much of a hassle to have links not auto open in Firefox when in deep sleep. This excessive battery drain doesn't make sense, and I was wondering if there was any fix for this. Thanks for taking the time.

I seem to have lost the search bar that allowed me to find certain emails in specific folders. I am now left with the one that searches all my email folders. Why? How do I get it back?

Thunderbird 115.6.1 (32-bit) on Win 10 and Win 11, local calendar, no email invites are sent to the listed Attendees. Correct email is entered on Calendar/Properties/Email and Notify attendees is ticked on New Event dialogue. Attendees are correctly entered under New Event/Invite Attendees. After clicking Save and Close, there is no Invitation email record in "Sent" emails and the Attendees do not receive email invitations. The event *is* saved in the originator's calendar.

The invites were correctly sent on the Win 10 PC up until TB version 113 (?), when they stopped working after the update (I think). Eventually email and calendar data were transferred to a fresh TB installation on a Win 11 PC, but the invites are still not sent.

The only difference that I can see between this non-email-invite-sending version of TB on a WIn 11 PC and another Win 10 PC where the invites are sent, is that "Troubleshooting Information/Force Email Scheduling" is set to true on the non-working version and is blank on the working one. Clues where to look next?

Hi there I must say having used Thunderbird for probably ten or more years that V115 has been a big pain in the butt to get used to. Why change everything? It was fine before.

OK I can get used to a completely different layout and changed menus even though I don;'t want to but I cannot figure out how to change the background from solid black which I hate. I have spent several days on and off looking for an easy way to do this and can't find it.

So now I go to write an email and the black screen doesn't show anything with black letters of course?? What is the reason for this? So I have to change font over and over to white color.

When I read new emails no problem background is white and font is black like a normal screen. Who had this bright idea?? Please give me a simple solution not involving Css whatever programming such stuff I cannot figure out and don't want to learn. Thanks so much

The latest update of Thunderbird somehow made this message appear "This is an unsupported version of Thunderbird!!" (see attached picture). Is this a bug? I've checked the version on the homepage and it's the same that's running on my PC (Windows 11).

I subscribed to a blog as I usually do in Thunderbird but it ended up as a folder. I've tried to delete it but it doesn't go away. There are no posts in it either and resubscribing to the blog doesn't work - it just says I'm already subscribed. Any suggestions?

A while ago I subscribed to an RSS, but all that happened was that two empty folders were created and they're impossible to delete. They just return. I run the latest Thunderbird on an updated Windows 11 PC.

Hello. I am not familiar with this end to end encryption that Facebook now does for Messenger but now when I try to use Video Calling/Chat it tells me it is not supported by my browser, Firefox. I have never had any problems with it before. Is there a fix? Thanks

I am trying to open a website but I keep getting error code 522. I've tried using Chrome and it connects to the website with no problem. I've checked my privacy settings and I do not have that website blocked. What else can I check? I don't think it's an issue from the website side. If you want to check then check here : https://jewelcars.co.uk/

I just downloaded and installed Thunderbird.... I fire it up and the "three lines" button I need to click to add my email account details does nothing. So the software is not doing much at the moment. I don't know what to do. I uninstalled. Restarted...and reinstalled...but this did not work. What am I doing wrong here?

Duncan

Yahoo Mail was down for HOURS last night. When it comes back up overnight, I can login to my secondary emails (Yahoo.com) but the correct password for rshearin@verizon.net responds "server error"

Yahoo washes their hands of it because it's a "third party app."