Important: #Factlayer doesn't seem to be as popular for #Firefox as #MediaBiasFactCheck is. None of the fact-check extensions for Firefox are on their recommendation list, darn it, but I go by popularity and reviews next. There was a third one that was more popular, but its reviews were B-A-D. #CoSoSolutions
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i use factlayer simply because it's the only one that works on CoSo - btw factlayer uses mediabiasfactcheck data base along with a few other databases
instead of mediabias extension i use Stopaganda Plus which is also recommended on mediabias website and again uses mediabias database