My account is not syncing to any Firefox browser, extensions, passwords, bookmarks non of this attributes will be loaded to my browser back after re-installation, What might the issue be?
Thank you for your question about the Firefox Sync service.
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 this article.
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.
"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." This is not what dev think that it is not for. This is what EVERY Sync user use Sync for... I also have Sync to get an access to my Firefox at my parents home without to bring my PC. And today, with this how marvelous proton update, Sync is broken on every copy I have for Firefox. And the about:logins, synchronised since yearS is now empty. Only Bookmarks and History seem functional. My password is asked to activate back sync, but with "about:logins" destroyed (I can't say other words) I can't. Or more specifically, I can access my Firefox copy only from my main Firefox. What is the point of Sync service then???