How to synchronize only in the direction "Server computer" for one-off restoration?

A malware scan erased some of my addons. I want to restore it, but think that if I simply synchronize then the server will interpret it as if this new configuration is what I want (and so change the server). So, how can I make sure that sync is only from the server from my computer (hand)-?
Seems like a pretty fundamental question for me but I can not simply to find advice on this in the archives, etc.

In case anyone is wondering, I ran the vacuum cleaner "Junkware Removal Tool" (or possibly "Malwarebytes Anti-Malware") and the addons that were removed were: anonymoX, Flash Video Downloader, thumbnail Zoom more among many others.

Thank you.

Thank you both for your kind replies. Philipp, if I understand it right, that would work there had not been this case that I had added bookmarks and other things I want to keep.
.
In any case, I decided that I will reinstall the addons are deleted manually (which unfortunately very probably means that I'm missing out on a few). The thing is, I fell on this issue before and at this time there resolved manually, so I expected at this time was a more general solution.
.
Nevertheless, thank you for your kind suggestions!

Tags: Firefox

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