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Important update! On March 14, 2025, a critical root certificate in Firefox will expire. If you’re still using an older version (before Firefox 128 or ESR 115.13+), it’s crucial to update to Firefox 128 or newer to avoid issues with add-ons, DRM-protected content, and other features.

For full details, check out Update Firefox to prevent add-ons issues from root certificate expiration.

If you have questions about the update or need help with the process, this is the place to ask! Whether you’re just starting or you’ve already updated and want to share your experience, we’d love to hear from you.

Let’s come together, share tips, and ensure we’re all prepared. Drop your questions or insights below!

Hi people,

I have used Firefox for years but after the latest Microsoft Update it no longer starts or runs. Another product, Libre Office, also failed at the same time and I have been unable to resolve that problem either.

I have uninstalled Firefox, downloaded a fresh copy from the Mozilla website and reinstalled it a couple of times but when I click the desktop shortcut nothing happens. I can right click the shortcut and select the "run as administrator" command and something like the Firefox browser opens but all my shortcuts are out of date on it and the browser will not access anything on the net.

I also use Mozilla Thunderbird as my email providor and that is still functioning normally.

Is this some monkey business from Microsoft, a fault in Firefox or a fault somewhere in the inner workings of my computer?

Kindest regards, Colin Ballard, 23 January 2025

Every once in a while, Firefox stops allowing me to navigate to any new websites, instead giving only a page that says:

"Restart to Keep Using Firefox

An update to Firefox started in the background. You’ll need to restart to finish the update.

Your windows and tabs will be quickly restored, but private ones will not."

I have automatic updates disabled in Firefox settings, and I have gone into about:config and set app.update.auto.migrated to false, and yet this issue persists. It seems like Firefox is ignoring my preferences. I don't wish to restart Firefox while I'm in the middle of a bunch of work. How can I get past this message and continue using Firefox without restarting? Do I need to delete update files or something?

This random surprise block to my work is ridiculous. We need the flexibility to update/restart Firefox only whenever we're ready to.

I have a Dell XPS 1330 laptop. I need it to use my CanoScan 8400F scanner. I cannot download Thunderbird. I specified Win 7, 32 bit options. No joy. I donated to Thunderbird. HELP!

Is it possible to go back to an older version of Thunderbird? The new version without the columns is annoying. I like to sort via columns and can't with the 6.0 version. I'm also not thrilled with the vertical scroll bars that like to play peek-a0boo with you. Just leave then there. Stop being fancy.

I would like to go back to the 128.5.2esr version which did not have this problem. How can I downgrade from thunderbird 128.6.0esr? I have tried download page, but can get back to 128.5.2esr version.

Please find the settings for Proton email services. It might be useful to you and many others particularly to have a completely secure email system accessible.

Tks. Nigel Readings

My attempts to install Thunderbird on my new Lenovo computer always fail and end with a notice saying that the failure is due to the application being 'malformed'. I use Google as my search engine.

My old computer (also Lenovo) happily ran Thunderbird on Google.

Please help Thunderbird is by far the best email service I have used.

I have had issues with thunderbird. I use it to email customer for my Mitchell 1 software. I have used it since 2017. I have had to uninstall it and reinstall it or update it a few times over the years. It would not work this week. So I was going to uninstall/reinstall it. It will not let me uninstall it. It gives me a error that it needs to reboot to update. I have click yes and no many times. It has restarted my pc but it still gives me the same message. I have also tried to install it and it will show me the same message.

If you are finally ready to move from Eudora to Thunderbird, here are some tips from my experience today (a close relative had been notified that authentication would be required in the future, a feature not available in Endora.). Here are the steps I took:

1. First, do NOT install a current release of Thunderbird. It doesn’t have the required conversion tool. The import tool is on an earlier version of Thunderbird, probably not available after release 31 or thereabouts. I used release 17.0.9 for this and it worked well. https://ftp.mozilla.org/pub/thunderbird/releases/17.0.9esr/win32/en-US/
2. Eudora needs to be installed, and the import feature will do its thing. The import process will import the addressbook and all message folders. Although the messages were all captured, the addressbook import mangled content other than email addresses (such as phone numbers and postal addresses).
3. Do NOT use the resulting profile, even though you may feel the work is done. It is not. This is because Thunderbird has evolved since that old release of 17.0.9 happened and much has changed. Instead , do this:
   • Exit thunderbird
   • Copy the ...appdata\thunderbird folder elsewhere for safekeeping (that folder is at c:\users\<yourid>\appdata\roaming\thunderbird.)
   • uninstall this old version of thunderbird and delete the default appdata\thunderbird folder
   • install the current release of thunderbird
   • set up the email accounts. If POP, do NOT enter password to ensure no messages download in the interim.
   • exit thunderbird and, using Windows File Explorer, copy ALL message folders and files from the 17.0.9 profile’s imapmail or mail folder to the new profile’s imapmail or mail folder as appropriate in same location within profile, e.g., Mail\<accountname>\<all message folders and files> - this is important only for POP, as IMAP mail will autopopulate.
   • click the Tools>import>Import from a file menu to import the MAB addressbook (abook.mab and history.mab) from the 17.0.9 profile. There will be errors to delete if the old addressbook including phone numbers or postal addresses, but otherwise it works.
4. Now, do a backup for safety, exiting Thunderbird first.

So today I was using firefox for work with multiple tabs open, I try to open a new tab and I get this message " Restart to keep using firefox"

I have updates set to "Check for updates but let you choose to install them" And the browser was fully updated to the newest update apart from this newest one?

Every time I try to open a new tab I keep getting this message mean I was unable to save my work and lost multiple tabs ?

Can someone explain this ?

We have pushed Thunderbird 133 version to 100 users,and later found that 133 was testing version,shall we remove that version from installed machines or shall we wait?and let us know when you will confirm 133 version as released version?

As stated above, as of Jan 13th, the date of the last update, I can no longer download any email from the Yahoo/AT&T server. My Gmail email downloads like before the update. Did anything change to influence my AT&T account? I have no issues with accessing the email online, or my phone, so the AT&T email account still works the same everywhere but in Thunderbird.

I have successfully transferred my Thunderbird Profile to a new computer using the article on the website. (Using the instructions in Thunderbird itself didn't work.) I now have my Address Book and Folders set up, but none of the emails from before I installed Thunderbird on the new computer. How can I get these back?