One dedicated website, , uses a license key system for its Pro version. According to its official FAQ, the extension operates on a paid model that covers backend service costs, including translation APIs and cloud fees. To use the Pro version on multiple devices, you must log into your account on the website, enter your password into the application, generate a new license key, and activate it on one device at a time. The free tier, by contrast, offers only a limited number of requests—some users report that the trial quota can run out in as little as 20‑30 minutes.
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