LanguageTool Website Spellcheck (LTWS) is a versatile Firefox extension designed for web development and text editing. This subscription-based tool offers users the ability to check spelling easily on any web page by selecting text and either right-clicking or using the CTRL+Q hotkey. The extension features a user-friendly sidebar that displays all detected errors along with suggested corrections. It also supports over 30 languages, automatically detecting the language of the selected text or allowing manual selection. Additionally, users can create a personalized list of ignored words that can be imported or exported, enhancing their writing experience.

With two checking modes available, users can either connect to a local LanguageTool server or utilize the public API, which is rate-limited for security. The extension's customizable design allows users to choose between light, dark, or automatic themes based on system settings. For those concerned about privacy, a local server can be set up to avoid sending text to external servers. Overall, LTWS is an essential tool for students, bloggers, non-native speakers, and anyone who values accurate spelling in their online communication.