This is all I have on Sync :

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer
• https://support.mozilla.org/en-US/products/firefox/sync
• https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox
• https://support.mozilla.org/en-US/kb/firefox-sync-troubleshooting-and-tips
• https://support.mozilla.org/en-US/kb/change-primary-email-address-firefox-accounts

There is contact info in this and yes do have to create a account and wait : https://support.mozilla.org/en-US/kb/forum-response-firefox-sync-verification-email-faq

bro i try all but not fix my problem please any other way. i need mozilla support mail or mobile number

Abdur Rahman(আব্দুর রহমান) said

last 3 day ago i setup windown..

What exactly do you mean by "I set up windown ... "  ?

Did you change from one OS to another  ?

(We don't do support via email or phone )

i just setup windows 10 last 3 day ago.. but now my Mozilla account data not sync . this account i have lot of url bookmark . no bookmark sync

Abdur Rahman(আব্দুর রহমান) said

i just setup windows 10 last 3 day ago.. but now my Mozilla account data not sync . this account i have lot of url bookmark . no bookmark sync

But : did you update to Windows 10 from an earlier Windows version, or did you switch to Windows from another OS (Operating System)  ?

Did you use Sync without any problems before you 'set up' Windows 10  ?

None of the links that Pkshadow gave you were helpful  ?

last time my OS win 10 but its windows slow thats why again setup 10, my mozilla account before setup its work fine .. when i setup but not sync any data..

Happy112 said

Abdur Rahman(আব্দুর রহমান) said

i just setup windows 10 last 3 day ago.. but now my Mozilla account data not sync . this account i have lot of url bookmark . no bookmark sync

But : did you update to Windows 10 from an earlier Windows version, or did you switch to Windows from another OS (Operating System)  ?

Did you use Sync without any problems before you 'set up' Windows 10  ?

None of the links that Pkshadow gave you were helpful  ?

last time my OS win 10 but its windows slow thats why again setup 10, my mozilla account before setup its work fine .. when i setup but not sync any data..

Did you change the password to your Sync account  ?

If so : unless you have a backup of all your data, they are lost ......

Sync isn't intended to be a backup medium for Firefox data when the user re-installs the operating system. Its purpose is the "synchronize" Firefox data across multiple devices.

As far as the password for a Firefox Account goes, if the password is changed the Sync server clears all Sync data as the new Password can't decrypt the "saved" data.

yes i change password after windows setup.. but i need my old data.. anyway to recovery my data ?? its more impotent . please give me suggestion how i can ?

You can check if you have a C:\Windows.old folder with your personal data.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

cor-el said

You can check if you have a C:\Windows.old folder with your personal data.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

bro c drive full clear and setup so how i can see old windows

Abdur Rahman(আব্দুর রহমান) said

c drive full clear and setup so how i can see old windows

Maybe this could help :

https://www.easeus.com/file-recovery/recover-files-after-reinstalling-windows-10.html

If not : then read my earlier post about your data being lost unless you have a backup .......

Abdur Rahman(আব্দুর রহমান) said

yes i change password after windows setup.. but i need my old data.. anyway to recovery my data ?? its more impotent . please give me suggestion how i can ?

As I stated, if you change your Firefox Account Password your Firefox data gets cleared from the Sync server. You shouldn't have changed the Firefox Account Password with the new Windows installation.

My advice is to try the free version of Recuva and see what you can recover. https://www.piriform.com/recuva

But chances are that whatever file fragments that application can recover from your former Firefox data files will probably be not usable.