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I updated to 125 in order to install a new version of an add-on that has been made compatible. But two other add-ons are now incompatible.

How do I roll back to 115? I have a backup of my hard drive with 115 installed and working. Is it enough to copy the old Thunderbird folder and the /Program Files/Mozilla Thunderbird folder?

Thunderbird used to come with spell checking ready to go.

I have just installed the latest version of Thunderbird and have written a few words including a deliberate spelling mistake and nothing happens. I get the spell checking window but no message I press recheck text and nothing happens

The check spelling while typing box is ticked.

Is a dictionary pre-installed or do you have to install one first?

Please resolve.

Hi, Where are imap message filters stored under Thunderbird Nebula? On an exact transfer from Win10 Supernova to Win 11 Nebula, on separate laptops, my new imap message filter list is completely blank. Only my Local Folder filters appear - which do not work on live emails.

I can create new imap filters but I cannot find them in any msgFilterRules.dat file on the new Win11 system.

Any help you can give would be greatly appreciated.

I downloaded Thunderbird 120 and installed. All I get is error message saying windows is searching for thunderbird.exe and nothing else. Old version has disappeared and I can not uninstall - get same searching for uninstall.exe. I have tried re-downloading it and re-installing it 4 or 5 times, still nothing. help please.

Hello! After installing update 129.0.1, in the profile folder, along the path: AppData/roaming/mozilla/firefox/profiles, a folder "extensions store menus" appeared, it contains the file data.life.bin, which changes its modification date as if it was synchronized when the browser closes. I would like to know if anyone else has this folder and file? . I checked the file for viruses, it is clean. Thanks in advance for your answers).

When i do update my configuration settings changing by itself. Example, "browser.cache.disk.enable" is "false" but after every updates its always changing to "true". This happens only after updates.

My Firefox install apparently did a background update that did not complete, I get an error 'XULRunner / Error: Platform version '129.0' is not compatible...'

I did not (do not) have a profile I had logged into for that installation, but did have many passwords saved that I'd like to still be able to use if at all possible.

I have installed another instance of Firefox that is working (on platform 129.0), and am using Windows 11. I also turned off automatic updates in hopes of preventing this in the future.

The previous profile still exists in AppData/Roaming, but I don't know how/if I can connect it to the new installation I now have.

Is it possible to either fix the incomplete update or connect my old profile to this new instance so I don't have to reset all my passwords?

Thanks!