No. Unfortunately, it works exclusively in Chrome, and at least on Windows, Chrome accessibility is really second-rate. They broke the ability for screen-reader users to sign into our Google accounts in the Chrome settings months and months ago, and haven't yet fixed it. There are also tons and tons of other bugs in Chrome, all symptomatic of the fact that google doesn't seem to do any automated accessibility testing on anything, so every update of every Google app on every platform breaks something. I'll stick to Firefox, where I can depend on the fact that even the Beta's don't usually cause accessibility reversions; it sometimes takes a while for Mozilla to make new features accessible, but once something starts working, you can count on it to keep working. Every Google update is an adventure in "what did they fix this time, and what new thing is now broken?"

TL;DR: No. The extension is Chrome only, and I only use Firefox, because Chrome doesn't care about accessibility.