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Is it possible to have all my addons, extensions and bookmarks on a new PC.

I could swear when I went from one computer to another computer and signed into firefox that it showed me all my bookmarks, addons and extensions.

I'm on another new computer many years later and when I signed into my account I don't see my bookmarks, extensions and addons anymore.

Anything change since many years ago?

I could swear when I went from one computer to another computer and signed into firefox that it showed me all my bookmarks, addons and extensions. I'm on another new computer many years later and when I signed into my account I don't see my bookmarks, extensions and addons anymore. Anything change since many years ago?

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They should trickle in to your new installation. As long as you didn't reset the password, since that flushes the Sync cloud data.

If Sync doesn't work, do you still have access to the old PC?

I'll have to import my bookmarks from the old pc to the new one since the sync didn't work. Looks like if you get a new pc it won't bring back your bookmarks and addons.

How do i bring back my old addons?

As long as you are copying files, take a look at this transplant procedure. The source folder will be your backup from your other computer:

https://support.mozilla.org/en-US/questions/1474421#answer-1687884