Firefox 143 (Fedora distribution) throws SEC_ERROR_UNKNOWN_ISSUER error on many websites

When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. … (read more)

When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. For most of these websites I can simply accept and continue, but HSTS-only sites will not permit this.

Affected websites include but are not limited to (based on exceptions in the certificates section of Firefox settings):

Any help in resolving this is appreciated.

Asked by DeltaDizzy 1 day ago

Last reply by DeltaDizzy 18 hours ago

Cannot get messages from Mozilla Thunderbird

Hi! I can't get messages from my Thunderbird account. When I click "Get messages" nothing happens and it usually says "Done" on the bottom left corner. I have to use m… (read more)

Hi!

I can't get messages from my Thunderbird account. When I click "Get messages" nothing happens and it usually says "Done" on the bottom left corner. I have to use my domain's webmail account to get my e-mail and it only allows me to read it and delete junk.

I really would love to have my Thunderbird account working again as soon as possible.

Thanks so much, Nancy Pedersen

Asked by nancy36 1 day ago

Last reply by nancy36 19 hours ago

Rebuilding the Global Database does not complete (Mac)

My Thunderbird was not finding messages that I could see were there. I followed the advice here https://support.mozilla.org/en-US/kb/rebuilding-global-database. I dele… (read more)

My Thunderbird was not finding messages that I could see were there.

I followed the advice here https://support.mozilla.org/en-US/kb/rebuilding-global-database.

I deleted the (large) global-messages-db.sqlite (I have been using Thunderbird for a long time - and I am monthly contributor).

The rebuild gets to a certain point and then stops (as indicated by Tools Activity Manager). Always at the same point. I guess there is a bad message in there somewhere. But now I am worse off than before.

I tried rebuilding several times. I have also compacted the account folders of the account that stopped and then tried rebuilding.

I have many years of messages in there and I need a functioning search. What can I do?

Asked by camerojo 1 week ago

Last reply by camerojo 20 hours ago

How to stop synchronization between Thunderbird and Yahoo Mail

Hello...I'm currently having a problem with Yahoo Mail having too many messages in the account, and as a result, I cannot receive new mail in my Yahoo account. It was su… (read more)

Hello...I'm currently having a problem with Yahoo Mail having too many messages in the account, and as a result, I cannot receive new mail in my Yahoo account. It was suggested to use Thunderbird to download everything from my Yahoo Mail account. I've downloaded Thunderbird, set up the server parameters as instructed, and it appears to have downloaded (synchronized) everything just as it appears in my Yahoo Mail account, via iMap. I would like to currently (temporarily) stop Thunderbird from downloading and synchronizing with my Yahoo Mail account so that I can sort through and delete/save/organize what's been downloaded into Thunderbird, and delete everything in my Yahoo Mail account so that I can resume receiving new mail messages in my Yahoo Mail account. I like the Thunderbird app so far and am considering using it as a one stop app for all of my online email accounts...Yahoo, Gmail, etc. I apologize for taking up time and space for this question, as I'm presuming it's something pretty simple to do, but for some reason, I'm just not seeing how to do this in Thunderbird Settings. Can someone please guide me on how to do this? I used iMap to download/synchronize my Yahoo Mail with Thunderbird. Thanks in advance!!

Asked by jbchylln 3 days ago

Last reply by jbchylln 22 hours ago

Changing from POP to IMAP with existing e-mail name

I use the same e-mail address on my desktop and my Samsung android phone. I was told to change my desktop e-mail from POP3 to IMAP which I did and then told by the Thund… (read more)

I use the same e-mail address on my desktop and my Samsung android phone. I was told to change my desktop e-mail from POP3 to IMAP which I did and then told by the Thunderbird desktop forum to change also my phone settings from POP3 to IMAP. I was told in order to do that I needed to create a new account first and then delete the old account.

However, when I go into server settings and I put in my e-mail address from my desktop, it states "e-mail address already in use". Clearly I do not want to create a new e-mail address - just use the same e-mail address that is on my desktop so that I can access e-mails on my phone that appear on my desktop. Help please!

Asked by zbadger 23 hours ago

contacts gone

anyone know how to recover my email contacts in latest version ot TB, theyve dissapeared since using spam aniallater , with is now uninstalled. i have the same email acc… (read more)

anyone know how to recover my email contacts in latest version ot TB, theyve dissapeared since using spam aniallater , with is now uninstalled.

i have the same email acct on my other pc , could i recover everything from therte as its intact thanks

also my TB spam filters have now dissapeared [but still seem to be working] but filtering the wrong things. thanks if anyone can help

Asked by bill 1 day ago

Last reply by bill 1 day ago

Firefox not restoring both windows

I always have two windows of Firefox open, one for each monitor. Up until recently Firefox would always restore both windows exactly as they were before I right clicked t… (read more)

I always have two windows of Firefox open, one for each monitor. Up until recently Firefox would always restore both windows exactly as they were before I right clicked the Firefox icon in the taskbar and clicked "close all windows". This week however my browser will only restore one of the two windows I had open, and I have to restore the other one manually which is annoying. Can anyone help me bring back the old behavior so it restores both my windows every time?

Asked by okyrkjeboe 1 day ago

Reappearance of Blank Pages of 8 Grids under Recent Activity

Dear Firefox Team, It has re-occurred to my Firefox Browser of the latest version of 115.28 with some websites which I have recently visited however which have appeared … (read more)

Dear Firefox Team,

It has re-occurred to my Firefox Browser of the latest version of 115.28 with some websites which I have recently visited however which have appeared 8 grids of blank or white pages again under "Recent Activity" as attached with the image for your technical troubleshooting suggestion.

Those 8 grids of Recent Activity in the older version of Firefox browsers used to have shown colorful graphics or images representative of the recent websites I visited in the recent past.

May I know what I am supposed to do to recover those graphics or images?

Kindly offer any suggestion or solution?

Thank you for your kind attention.


Mr. Topaz Chiu

Asked by Mr. Topaz Chiu 3 days ago

Last reply by Mr. Topaz Chiu 1 day ago

Thunderbird Flatpak Runtime issue

hello the flatpak update command tells me that the runtime is eol and its used by the flatpak thunderbird. can you please update the runtime soon? i add a screenshot of … (read more)

hello the flatpak update command tells me that the runtime is eol and its used by the flatpak thunderbird. can you please update the runtime soon? i add a screenshot of the issue, its in german. please review this as fast as you can please greetings oski

Asked by Oskar 6 days ago

Last reply by Oskar 1 day ago

UI glitch

Need to separate the system info. strip with time, date, and battery on top which is overlayed on the horizontal bar with browser tabs. Problem came about after update to… (read more)

Need to separate the system info. strip with time, date, and battery on top which is overlayed on the horizontal bar with browser tabs. Problem came about after update to iPadOS 26

Asked by Alexa 1 day ago

Collections missing from home page

I am able to save tabs to collections. However, there is no collections section on my homescreen, despite support articles and questions indicating it should just be ther… (read more)

I am able to save tabs to collections. However, there is no collections section on my homescreen, despite support articles and questions indicating it should just be there. When I turn shortcuts and stories on, they still do not appear. How do I make collections show up?

Asked by Felderburg 2 days ago

Last reply by Felderburg 1 day ago

Invitations are not sent

In Thunderbird 143.0.1 (64-bit), my appointment invitations are no longer sent automatically to the respective email recipients, as they used to be. I can't find any sett… (read more)

In Thunderbird 143.0.1 (64-bit), my appointment invitations are no longer sent automatically to the respective email recipients, as they used to be. I can't find any settings where I can change this. Under ‘Troubleshooting Information’ in the line ‘Send appointment notifications via email’, the value is not set to ‘true’. I look forward to your help. Best regards, Thorsten

Asked by info13115 1 day ago

strange font

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter] i dont know if its a stra… (read more)

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

Asked by bill 1 week ago

Last reply by bill 1 day ago

"Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window."

Every time I boot Win 10 Pro, a half dozen Firefox pop-ups complain as indicated, as well as the wrong google page login (Voice instead of Calendar). There is no Firef… (read more)

Every time I boot Win 10 Pro, a half dozen Firefox pop-ups complain as indicated, as well as the wrong google page login (Voice instead of Calendar). There is no Firefox showing in the Windows>Task ManagerStartup> list. Firefox(143.0.4 (64b))> settings>General> Startup> has only [check for default]. I cannot find the controlling 'Startup' controls.

Asked by JFfB 1 day ago