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Every time I use YouTube on Firefox it feels like a mental torture. It starts off with micro-stutters initially - annoying but nothing crazy. After some time the loading speed of the website and the videos themselves increase dramatically. And eventually it becomes unusable:

• Scrolling feels like the website is running at 30 fps
• The videos take several seconds to load
• It also takes multiple seconds to catch up when you select a specific moment of the video

The only solution so far has been restarting Firefox entirely, just close and open and pray. Then the problem comes back after some time.

Solutions I Tried:

• Disabling AdBlock (didn't work)
• Enabling Hardware Acceleration at all time (didn't work)
• Uninstalling unwanted Extenstions (didn't work)

All of these problems disappear when using Chrome or Edge.

Samsung Galaxy S24 Ultra running latest Android update and latest Firefox update. I set Firefox as my default browser. I have un-installed all updates for Samsung Internet and removed all permissions for it. Disabling it is greyed out. Some apps that I use have links to websites. Too frequently, when I go to one of those links, the intro screen for Samsung Internet opens. Then, when I look at the settings in Firefox it is no longer set as the default. Then I set Firefox to default and go to my phone settings to see that Firefox is selected as the default. If I open the previously mentioned app and choose the web link, Firefox will open. But somewhere along the way, the default changes back to Samsung Internet and it's a vicious circle. I have posted in a Samsung forum but haven't gotten a reply that solved the problem. Please help. Thanks Mike

Am using 115.10.1 Thunderbird on Windows 10. This email account inbox shows one unread message, but I can't find any unread message. Toggled message threads to see if a previous message was unread, but could not find any there either. Have both closed Thunderbird and restarted the computer, but it made no difference. It is bothersome, but my main concern is whether this is indicating some virus or other hack of my computer. This is just a home computer, not on a business network. Do have it on wi-fi. Is it just a matter of somehow resetting the unread message indicator or is it a sign of something more serious?

why does my hotmail in thunderbird sometimes get my emails and other times it says "Sending of password for user *********@hotmail.com did not succeed. Mail server pop-mail.outlook.com responded: Authentication failure: unknown user name or bad password"? Then it starts getting them again. It's totally random. Every once in a while it does it with my .live email too. Yet other .live and .hotmail addresses never have a problem? TIA

Hello, I've been using Thunderbird since it first came out may years ago and have been a satisfied user. Sometime in the past year, after one of the Thunderbird updates, Thunderbird became EXTERMELY slow to open. It takes over a minute. I have looked for solutions here for the past year...no luck (I've read through most all of them here, that have to do with slowness of Thunderbird opening, as well as on Reddit). I've tried basic troubleshooting e.g. clearing Thunderbird cache, increasing cache to huge size. I've seen references to the slowness being related to "multiple calendars". I don't use calendars on Thunnderbird and went as far as to delete/disable the default one that was there. Still no improvement. I know its a Thunderbird specific problem since:

a. I don't have this slowness opening any other program on my Mac (opening it or using it) b. I don't have a problem with performance of Thunderbird once it finally opens c. It all started in 2022 immediately after one of the Thunderbird updates.

I am on: Mac Air M1, Ventura 13.2, 16 GB Ram Thunderbird 102.14.0 (64-bit)

I hate to ditch Thunderbird after using it all these years and being a very early user since it came out, but I am at wits end. Any help is appreciated. Thanks for any help in advance!

On startup TB pops an error box up saying ' There is no email program associated to perform this action'. When dismissed TB continues to open normally. No other errors seen during operation.

I have checked my Win 10 Control Panel Apps options. TB is the email default. MailTo, file type .eml and all other settings I can see are set to TB as well.

Hi! I'm looking for emails in Thunderbird that contain "team energy". Why I get search results which have only "team" or "energy" in their text? How can I search for Mails including "team energie"? For the programmer: Why I get "results" with only one of this words? Why I get "results" with false words ("energy" instead of "energie"? Kind regards and happy search results Hans-Jürgen Dammann

I cannot print from Firefox. It worked fine, and then stopped. I'm not sure what changed. It doesn't matter what printer I use. Even printing to PDF fails. No errors appear, and nothing shows up in the printer queue. All the other applications in Windows print just fine. It's just Firefox. And just for this one Windows user.

I tried clearing the saved printer settings in the about:support page. I tried refreshing Firefox. I tried uninstalling and reinstalling Firefox. I tried uninstalling, removing the mozilla folder in %appdata%, and reinstalling Firefox. No luck.

The only time I can get it to print anything is to log into a different user account on this same PC. Printing from Firefox seems to work then.

It seems there is some user-specific printer setting/file/whatever that is messed up. I'm not sure what else to try.

Thanks.

I can't send email from comcast.net account. Outgoing server (SMPT) ERROR. Comcast said problem with mozilla. What should password be for comcast smtp://smtp.comcast.net (smtp://smtp.comcast.net)?

Whenever I try to print something in Firefox my printer list only shows the last half of the network address, excluding the critical make and model number of the printers. Because of this, it's very difficult to determine which printer is which from the list.

Automatically hide taskbar in desktop mode => Enabled Firefox => Maximised When cursor is moved to outer edge of screen, taskbar should unhide (Expected behaviour) but in this case it remain hidden (Reality). Firefox along with all other spinoffs give same result. Chromium based browser works perfect, and taskbar automatically unhide itself.

As OLED screen have became common as monitor, Taskbar auto-hide is must. If this issue cann't be fixed I may have to change my primary browser which I used for almost 15 years.

Kindly, look into it. If Chromium can do it, why not Firefox.

Thunderbird latest auto-download version Windows 10 22H2 Mozilla Crash reports sent a few minutes ago.

After deleting around two thousand inbox messages last night, TBird crashed during the compacting cycle. I have not cleared the trash folder.

Several attempts to restart it have failed. Each time I am asked if I want to compact, I click Remind Me Later, so as not to further complicate startup.

The window opens and I can see the menu, tab and filter bars. Tabs have no text. The message window is blank, with no column dividers

The status bar freezes while looking for new messages on one of the account servers, and the blue progress bar is lit and static.

I cannot access any menus, all controls are non-responsive.

Task Manager shows CPU & Memory activity (they are not static). See images.

I know the compact cycle take take time. It's been at about 21 hours since the deletions.

Hi, this issue has been present for a long time for me, and with many versions of Firefox Nightly for Android.

I'm always using the latest nightly for browsing Youtube only, with a set of specific settings and addons (since we can't use profiles on Android yet)

My problem is I've configured the Homepage to never show anything but a few URLs I chose to pin, you can see my settings and my homepage in the screenshots attached.

Despite the "Recently visited" setting being disabled, sometimes, but not everytime, the last pages I visited are added to the Homepage, after the pinned sites. I have no idea what triggers it or not, if I'm doing something wrong or if it's a bug.

Thanks for your help !

I've just started getting error messages that I need to enter my password to send emails. I've tried that but it still keeps saying unable to connect to the server. This has been happening for about two days now. I've tried updating Thunderbird, restarting Thunderbird and restarting my PC. None of this has worked. I made no changes to my system, software or home network. Any help would be appreciated. Thanks, Dave

Thunderbird recently upgraded (?) to Version 15 on my Windows 10 laptop. Since them, when I go to look at the "Trash" folder, I get the message: "Unable to open the summary file for Trash on username@gmail.com. Perhaps there was an error on disk, or the full path is too long." I was able to fix it temporarily by restarting Windows 10, but the error is back a few hours later.

I have an iMac (Core 2 Duo) running Thunderbird 115.8.1 on Mac OS X 10.13 High Sierra. Thunderbird works fine when I'm actively using it. The problem arises when I close the window and switch to a different app. If I let Thunderbird run in the background for a while, the processor gauge (iStat Menus) will indicate that Thunderbird is using more than 100%, typically about 120-130% cpu usage. As soon as I switch back to Thunderbird (click on it in the Dock), the processor usage drops way down to normal (about 2%) and will stay that way as long as Thunderbird stays in the foreground as the active app. If I close the window and switch to the Finder or Firefox, Thunderbird will eventually start overusing the CPU again. It doesn't happen immediately... probably about 20-30 minutes of being idle in the background.

I've got Thunderbird set up to check one Gmail account. Nothing else. I used to have a different email account, but removed it.

Checking the logs in Console hasn't been helpful thus far. High Sierra seems to flood the logs with unrelated information.

I've noticed this issue for several revisions. I kept hoping that the next update would fix things. No such luck as of 115.8.1. Anyone have ideas how to fix this?

Edit 2024-03-14: I changed the subject to indicate that the problem occurs when the window is closed. It has nothing to do with being in the background vs. foreground.

What does repair folder actually do?

A search online gets answers like 'it rebuilds the index', but that's not very explanatory. Does it recreate the index by looking at the folder contents or by going back to the server and downloading emails again?

After a couple of odd things happening (emails appearing in the web version of Gmail, but not in my Thunderbird Inbox), I decided to repair my Inbox. It's an IMAP account with Gmail, and has got over 700 messages in it (yes I know, time for a clear out...).

Thunderbird went slow for quite a long time (like half an hour at least), and messages kept flashing up in the status bar at the bottom saying stuff like "Downloading message 237 of 700". When clicking on messages with large attachments, while the repair was apparently still underway, the messages took some time to load, though they seem to be about normal now.

Was it really downloading emails? I ask, because I have some archive folders MUCH bigger than the Inbox, and would like to know what to expect if I have to repair other folders.

For info: Thunderbird 91.11.0 (64-bit) running under Linux Mint 19.1

All of our "read" emails, --from all of our accounts -- have suddenly disappeared. All of the folders and subfolders are still present. We still get new email, but as soon as we read it, it's gone. We have had these same email accounts for years and have not made any changes. In Account Settings --> Synchronization & Storage --> "don't delete any messages" is checked. "Read" messages are still on our server.

So, 1) Why did this happen? 2) Is there any way we can get our messages back in Thunderbird?

Hello community. My company decided, right before Christmas, to force-migrate all e-mail addresses from the functioning old servers to "Exchange Online", which not only made the web-browser based access more complicated, but also required changes in Thunderbird. While they provided instructions, which I slavishly followed (despite being usually rather hand around the computer), I still cannot send e-mails with my work address - they get timed out. My company IT are notoriously unwilling to help with issues on the private computer and have recommended even beforehand to from now on only use the web-based access to avoid trouble - which is laughable, for me, as I need my e-mails offline as well. So before harassing them more loudly, I wanted to make sure it's a fault on their end not on mine.

Some details: New server is outlook.office365.com, SMTP port 587. Security level is STARTTLS, authentification OAuth2. These are the changed options requested by the company IT. The window popping up when trying to send a message asks me to chose a certificate for athentification and suggests "Adobe Conetent Certificate 10-7". Neither installing this manually, accepting, or changing something under "further options" changes the outcome that the message will be timed out. As my private e-mail also uses port 587, and it still works perfectly normal, this port is not generally blocked by the windows defender or antivirus (I use Kaspersky).

Maybe someone has an idea what it happening here? Or knows if to slve it by installing a particular different certificate?