侧边翻译 is a browser extension tailored for users seeking improved comprehension of foreign literature. Operating on Firefox, it leverages the Google Translate API to deliver accurate translations of words and sentences without disrupting the reading flow. The extension features a convenient side pop-up display that allows users to view translations while reading, and they can opt to pin this display for quick access to frequent translations. This design minimizes content obstruction, ensuring a seamless reading experience.

In addition to web page translations, 侧边翻译 supports PDF text translation, although this feature is currently limited on Firefox due to a known browser issue. Users can customize the translation details displayed, choosing between common meanings and in-depth definitions, which include pronunciation and example sentences. The extension also incorporates keyboard shortcuts for enhanced usability and offers a blacklist option to prevent translations on selected pages, making it a versatile tool for diverse reading preferences.