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The Google Chrome extension that works very well for me is Voice in Voice Typing, but I also use its Developer's Dictanote software Dictanote - Make your voice type for you which you can use with a browser to type into and then copy and paste into any application.
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What I have found that works quite well for good accurate dictation are some extensions and applications but they only work in Google Chrome type software. I prefer to use Mavericks, 10.9.5 which has the original Mac OS dictation which has a lot to be desired, and I haven't noticed any huge Improvement in later macOS versions when I have had a chance to use it.
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I am in a similar situation to you as a result of psoriasis rheumatic arthritis and gout in my hands and Dragon Dictate for the Mac went kaput when my condition became serious, so I don't even have it to use.
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