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Which extension is only under Firefox quantum available and was never legacy? (chameleon was a good begin and with your last edit I understand your problem but solvable)
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I have only 64-bit software but Chapter 3. Configuring Virtual Machines says it’s possible on your 32-bit system if you have a 64-bit processor. Only atom processors was 32-bit in the past but I’m unsure. This problem is very old and not longer mainstream.