Hover is a Chrome extension that displays IDE-style tooltips simply by hovering the cursor over code blocks on web pages such as documentation sites, ChatGPT, and Claude.
Chrome Extension Hover Released to Display IDE-Style Hover Documentation on Web Pages
This article is a translation. Read the Japanese original
Regarding its operational principle, when a code block appears on the screen, the extension detects the tokens and sends them to an LLM via OpenRouter or a custom endpoint.
The explanations generated by the LLM are cached and displayed immediately upon hovering.
Permission management is based on the Chrome system, allowing for individual settings so that the extension only operates on authorized sites.
Another key feature is the ability to specify corporate infrastructure, such as AWS Bedrock or Google AI Studio, as custom endpoints.
The technical stack consists of TypeScript, Vite, and the Chrome Extension API, with a release on the Chrome Web Store planned for the near future.
Sources: Show HN: Hover – IDE style hover documentation on any webpage (HN 58pt, 27 comments) (HN Search (backfill), 2026-01-05)