If you need to reset your Firefox Account password, it will reset your Firefox Account data, 100% of it.

Do you currently have these bookmarks saved on a device?

The password of the Sync account is used to encrypt your personal data locally before uploading and only the password used for encrypting can be used to decrypt this data. That is why changing the Sync password invalidates (removes) all data stored on the Sync server.

No, I reinstalled my pc without knowing this would be a problem.. Didn't make a back up before and it has been a very long time since I made this password.. When I had to reinstall Firefox I assumed it was somehow connected to this pc or my email, but unfortunately it doesn't seem to be linked to anything.

When refreshed or reset or formatted you lost the token that Sync put on your h/drive which has changed over the years also.

It appears from your question, that you are using Firefox Sync as a back up service. This is not what Sync is designed to do. The Firefox Sync service takes a copy of the data you wish to include and transfers it to a second device (typically a mobile device such as a tablet or a telephone) running a copy of Firefox. The storage in between all attached devices is both temporary and fragile and is not stable enough to be (and is not designed as) a reliable backup service.

If you have a copy of your Firefox profile for desktop Firefox, you may be able to recover your bookmarks and other data. Please have a read of these article.

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

If you have a copy of your data on a mobile version of Firefox, please follow these instructions to connect it to Firefox Sync to copy your data.

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer#w_connect-additional-devices-to-sync_

Please let us know if this solved your issue or if need further assistance.