> TFA most commonly refers to Trifluoroacetic acid, a highly persistent, mobile "forever chemical" (PFAS) found globally in water and soil, widely used in organic chemistry as a solvent.

The irony is that web searches for an explanation of something often lead to a discussion thread where the poster is downvoted and berated for daring to ask people instead of Google. And then there's one commenter who actually actually explains the thing you were wondering about.