ChatGPT summaries that follow you across the web

What it does Glarity is a browser extension that annotates whatever page you are already on. It pulls content from search results, video transcripts, news articles, academic papers, and email threads, then asks ChatGPT to summarize, translate, or draft replies. The target list is wide and multilingual—Yahoo! Japan, NewsPicks, Nikkei, Bilibili, PubMed, PMC, and Bing all have explicit support—and the authors claim it works on arbitrary web pages. Authentication options include the official OpenAI API, a ChatGPT Plus session, or an unspecified “Glarity AI model.”

The interesting bit Rather than confining AI to a chat tab, the extension treats every site as a document to be annotated, turning the browser itself into a persistent reading and writing assistant. It is also refreshingly upfront about its origins: it began as a fork of a Google-specific extension and incorporates code from at least two other ChatGPT-related projects.

Key highlights

• Covers territory Western extensions often skip: Yahoo! Japan, NewsPicks, Nikkei, Bilibili, and PubMed/PMC.
• Bundles side-by-side translation and a Gmail quick-reply feature, so it writes as well as reads.
• Supports Safari on iOS and macOS alongside Chromium and Firefox.
• Renders Markdown and code highlighting in summaries, with a dark mode toggle.
• Explicitly warns Brave users to disable language fingerprinting protection for the extension to function.

Caveats

• The “Glarity AI model” is name-dropped but never explained; the README does not clarify if it is local, hosted, or simply branding.
• Because it is a fork that borrows from multiple predecessors, those seeking a clean-slate codebase will find this is built on existing work.
• Brave users must manually disable a fingerprinting shield setting.

Verdict Worth a look if you want one extension that summarizes and translates across a wide, multilingual swath of the web. Look elsewhere if you need deep customization or prefer entirely original codebases.