划词翻译 is a subscription-based Firefox extension designed for language translation and reference. With its high-accuracy integration of Google Translate, it ensures consistent translation results that match those found on the official Google Translate website. Key features include a mouse hover function for instant translations, customizable settings for word selection, and a built-in independent translation window that listens for clipboard activity to automatically pop up translations. The extension also offers a PDF reader, voice reading capabilities, and supports historical records and favorites that can be exported in multiple formats.

In addition to text translation, this tool is expanding its functionality to include audio and video translation during beta testing. Users can access a wealth of information including phonetic pronunciations, detailed definitions, and etymological roots for English words. With shortcuts for quick translations without switching applications, this extension caters to a variety of translation needs, making it a versatile choice for language learners and professionals alike.