I bought a used computer, Firefox is warning me not to sync because this will merge my data with the previous owner's. How to fix?
I already ran a full factory reset, not sure how I can go any deeper to clean out existing info.
Chosen solution
If you want to make sure that you do not have leftover data from the previous owner then you should create a new Windows account.
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I assume you created a new Windows user account on this computer ?
Did you copy any profile data to this device from another device ?
Did you give the new used computer the same name as another computer you used with this Sync account ? You can try to modify the name of the device in the Firefox Sync settings in "Options/Preferences -> Sync".
I didn't create a new windows user account, I intentionally avoided that step. This is a new Firefox account, it doesn't have any info from my prior computers. I actually don't want to sync anything, privacy and a fresh start was the point of a new computer, but this message has me concerned about potential lurking info or tampering by a previous owner.
Chosen Solution
If you want to make sure that you do not have leftover data from the previous owner then you should create a new Windows account.