Does a replacement exist for Dexter? (A tool that reconstructs data from a pdf of a graph)
You question reminded me of a tool I first encountered in the 80’s (I know right!) called “data thief”. Back when Mac applications had a four letter “creator code” this one had the code “DIEF” (which is the Dutch word for “thief”).
I appears to be around still - and as it doesn’t rely on a browser it may well still work (I haven’t tried in years though).
Take a look here