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Suddenly without warning Thunderbird displays a message 'Checking mail server capabilities.......' in the bottom left of the inbox screen. Messages from the server [Optus] are not downloaded. I have changed the SMTP server to the default 465 and changed the security setting to 'None' but the problem has not been resolved. I note that there are alot of queries about this problem but I cann ot find a solution anywhere on the Mozilla help pages.

Hi. I was receiving emails until 10:30am yesterday and then nothing. No emails are being received on any of my email addresses since then on my Thunderbird site. I can receive them on my phone, so I know I am being sent emails but nothing on my computer. When I click "Get Message", nothing happens. When I try to send a email - "Add Security Exception" screen comes up saying you are about to override how Thunderbird identifies this site. Why has this just started and what do I need to do to be able to receive and send emails again?

I have tried multiple times to add an email account to thunderbird in windows but I keep getting the error, "Unable to log in at server...". I know the details are correct as I'm copying and pasting them from my password manager so I'm not sure what the problem is.

Hello,

I'm not able to upload files to certain websites using Firefox on Android.

When selecting a file for the phone's file manager, the file upload simply not starting.

However, Firefox on iOS doesn't have that issue.

Firefox version used is the latest one and it is the one from Google Play.

Tried another browser and it works great.

Guillaume

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

Hi, last week my Thunderbird started slowing down and then appeared an error which caused it to freeze (i wasn't there so i don't know what error). The program was force closed and opened again, and it started re-downloading messages in the inbox (probably repairing).

For some reason it also started running all the filters and sent a ton of old emails from the inbox. I closed it again and after opening it it worked fine, and it continued downloading messages during the weekend. Today it worked fine all day until it started running the filters again. I closed it and opened it again and it continued sending emails, so i had to close it.

I'm not sure but it may have happened after making a new filter, which is strange because i have about 180 filters and this never happened before.

I'm now afraid of opening thunderbird because it may continue sending emails.

Could this be a thunderbird bug or an add-on issue? I have Send Later as well as FiltaQuilla, which i disabled the last time i opened thunderbird.

For several months I have been experiencing very frequent tab crashes and overall freezes in Firefox. I have tried removing all extensions and starting in safe mode, but nothing has solved it. I have reinstalled Firefox and updated all of my drivers. There doesn't seem to be any pattern to what causes the crashes and freezes. They can happen any time and on any website. They happen around 5 times an hour. I do not know how to troubleshoot any further.

Hello,

I have been facing this issue when accessing Google Drive using Firefox, after selecting a file and clicking on "File information" option the "Details" and Activity" tabs simply don't load, as you can see in these screenshots.

Also, I found this thread also here on Mozilla Support from two years ago that reports the same issue. Apparently the bug was solved but ended up returning in most current versions.

I opened the current thread just to report this bug again. Thanks.

EDIT.: Another user reporting the same, his thread was archived: https://support.mozilla.org/en-US/questions/1422875

This has been a problem for a while, currently on Firefox 126.0 and Nvidia 550.78. I can work around the problem by forcing webrender to use software mode.

When using HW accelerated webrender with my Nvidia graphics card everything works fine until the PC wakes from sleep, then graphics are broken and Firefox needs restarting. Most noticeable for me is when looking at Grafana graphs they will look like random lines, and my Frigate NVR snapshots only display some of the time.

Is there anywhere in Firefox that will show a log of any error messages to do with the graphics card? I would like to try and fix the problem rather than disabling HW acceleration, but with no logs to look at that is impossible. No other programs seem to have a problem with resuming from sleep, and no error messages are shown in any of the system logs.

I have Thunderbird 115.11.1 running on a Mac Mini M2 Sonoma 14.5.

I use a Kensington USB PC Keyboard which is set to "British-PC" in the Mac Keyboard settings to give the correct layout.

If Thunderbird is the first app I launch after I log in (the password entry at this stage works fine) it seems to stop the keyboard from being recognised by the Mac until I go into another app (Google or Text Edit for instance) which then seems to make the Keyboard visible again.

Are there any settings in Thunderbird that might clash with the system keyboard settings and cause this?

If I use other apps before launching Thunderbird it works as normal, it seems to happen if Thunderbird is launched first.

Thanks for any help.

Didn't have this problem before but after a couple days ago, I didn't know what changes happened to my computer but most of the program wouldn't work except I have to run it as administrator. The download problem occurred when suddenly my FF always froze no matter if I closed it or not. So I just refresh my FF and copy my profile from the old backup data that FF generated and just pasted all of them on my new profile. The problem is that after I tries to download warcraft 3 maps from google drive, the download always occurs as failed. I don't have this problem when I tried it with Edge. Running FF as admin doesn't worked either. Neither as when I run FF as refresh without any extension. Downloading stuffs with IDM (Internet Download Manager) does not have any problems. Just now, I try to download a .xlsx files from my workplace websites. After I click on the download or the file itself, nothing occurs as if nothing happened. This is giving me a headaches so I came here to give it a try if anyone can help me fix this problem.

Hello,

I am experiencing an issue related to the Vanguard anti-cheat system used by Riot Games, specifically in relation to League of Legends. After installing the game and Vanguard, I am unable to open Firefox. When I try to launch Firefox, nothing happens. However, if I change the name of the firefox.exe file, I can start Firefox on a different profile, but it only works for a short period before becoming unresponsive. None of the options or tabs respond after that.

Could you please provide assistance on how to resolve this issue?

Thank you.

i cant get firefox to open main page no matter what i try. Ive download it a few times and then it ask me to no let it fix it i did and then it still wont open.use firefox more than any site. ty if you can help.

Using TB 115.11.0 (32-bit) on a Windows 10 machine, with IMAP synchronization. Quite often (but not always) the synchronization of the inbox takes an extremely long time, Activity Manager showing "bringing folder inbox up to date" hanging in "downloading message 1 of ...".

I have made a Gecko IMAP:5 log and see (during this state) a pattern repeating every 2 minutes, ending in "idle mode async waiting". Then, after a long time suddenly the synchronization process finishes.

What can be wrong here?

Hello everyone! I have a really nasty problem (for almost 3 years now) that I just can't get a handle on (and I don't know the root cause 100% either). Here's my situation:

• We have a self-check-in terminal (kiosk) that is used in hotels
• The terminal runs a web app in FF full-screen kiosk mode (-kiosk flag)
• 99% of the time everything works fine and without any problems
• Sometimes though, the problem occurs that the entire browser content no longer responds to touch events
• My app continues to run, we see the visual feedback from the touch monitor, but Firefox no longer responds to anything
• If you connect via AnyDesk (our remote maintenance tool), you can click with the mouse
• Even the DevTools don't respond to touch interactions
• As I said, everything is fine via mouse interaction (remote)

What I have already tried:

• Disable hardware acceleration
• Browser restart every day at 4:00AM (so far so good, but it still happens sometimes in between of these restart windows)
• Set the widget.windows.window_occlusion_tracking.enabled to "disabled" - I read that the problem could be related to that

Does anyone know the problem and can help me? It's really critical for our business, as the guest cannot interact with the device and only a browser restart helps.

One more thing: I saw today that a second Firefox.exe process was running. After killing it, it worked again. What kind of process could it be that is affecting the main app so much?

THANK YOU

This pops up every few hours. Sometimes it pops up invisible but steals focus from the main window. How can this be disabled?

I tried all methods that have been mentioned everywhere on the Internet, including policy.json, Group Policy on Windows, etc. Nothing disables this nagging yet.

Hi. I have to sign in related problems.

I can't Sign in to my work planning website: tjeps.g4s.dk/ESS/. It works fine on Firefox for Windows but on Android I get a new Sign in formular every time i try to sign in. Works on Chrome for Android.

The mandatory Authenticator app in Denmark for all public services "MidID" is not supported on Firefox for Android. Works on Firefox for Windows. This is a huge problem if you wan't Danish users. Also works on Chrome for Android.

I wan't to leave the Google Chrome browser but I am kinda forced not to.

-Jimmie

I have installed firefox in my laptop for years. after latest update, firefox runs just fine only for the 1st time, then after closing the app / restarting the laptop, firefox keep giving error (attached) I have tried to refresh, run troubleshoot mode, uninstall and reinstall again at one point I was able to recreate the issue only after reinstalling firefox 126.0.1 portable version and then syncing to the profile ( run ok for 1st time, then it broke down after closing it) The problem also seems repeatable using firefox 115 protable Now, I tried to reinstall the portable version from scratch, it keeps hitting same error from 1st run

I have also double check the firewall and antivirus to make its not blocking All other browsers works just fine

How can I check what is being loaded on my computer with my browser Firefox when I start up Firefox. It takes too long for my homepage to load compared to other browsers. Can someone help so I can determine what is being loaded when I start up my browser Firefox? Thank you.