I'm mainly listing all this for my own reference if it happens again, or for anyone else who may search on the same problem. I'm still researching it.
I checked my about:config, as well as running tasks in Task Manager, and my Windows folders for any files with recent dates. Haven't found anything suspicious yet.
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Date: 2019-04-23 04:15 am (UTC)From:I checked my about:config, as well as running tasks in Task Manager, and my Windows folders for any files with recent dates. Haven't found anything suspicious yet.
I ran this scanner; it didn't detect any rootkits:
https://support.kaspersky.com/viruses/utility#TDSSKiller
I ran AdwCleaner; it didn't find anything.