Can the prefs.js file become infected with malware?

I am trying to solve an issue with my computer and I have done scans with AdwCleaner. The scan results list my Firefox "prefs.js" files, both for my own user account and for the Guest account. IS there any chance of that file becoming infected with anything?
Probably not I suppose, a false positive perhaps?
That said, here is my issue in case anybody recognizes the symptoms and can help.
After a fresh boot my Internet is abnormally slow, down by 90%.
So far I have determined it is probably not hardware related not due to any background network activity.
This does not happen if I boot into Safe Mode, or even if I boot into the "Guest" user account.
I found a workaround: In device manager I "Disable" and then "Enable" the NIC (network adapter).
After my "fix", Internet connection speed immediately jumps back up to my full normal speed.
The speed slowdown never returns during that current session. It only returns after the next boot.
Back around the first of the year I did have a run-in with "Conduit" and eliminated it. A month ago I had a run-in with "Iminent" and eliminated that as well. There are, however, a number of orphaned Registry keys relating to the "Iminent" encounter but no software or toolbars associated with those keys.
Again, this problem only occurs after a fresh, full boot, only when booting to my own User Account, and is easily worked-around by re-enabling my NIC in device manager.
Ring any bells?

Some extensions do store data in prefs.js.
Does your scanner indicate why it finds the file objectionable? Perhaps you can remove the problem material another way. For example, if you open the about:config preferences editor and look for any appearance of the word conduit and clear those out, maybe prefs.js will pass the next scan?
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) Use the search box above the list to filter down to preferences containing relevant terms. For example, you could type or paste '''conduit''' and pause while the list is filtered.
If there is a string-type preference you want to clear, you don't have to open it for editing and delete it. Instead, you can right-click > Reset it.

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