Turn selected page content into lookups and summaries

They built a Gemini-powered Opera extension that explains selected text or images and summarizes pages without leaving the browser.

Done with Geminiยท Intermediate

What they did
A commenter made their own browser extension for Opera and wired Gemini into it so they could skip opening the Gemini web app. From the page itself, they could highlight text or use the right-click menu on text and images to get a lookup, or right-click other content to generate an article summary. In a follow-up, they said the extension was using Gemini 2.5 Flash at the time.
How it went
The extension handled in-browser lookups and article summaries inside Opera. The thread did not include performance numbers or a deeper review, and it did not mention any extra human-check step beyond the user deciding what to click.
Tips
If you try this yourself, keep the actions limited to selected content or a clearly chosen page section so the agent only works on what you intended. Use a pause before any irreversible action, and make sure the model version matches the job you want it to do.

Try it yourself with Gemini

In [browser/app], when I select text or an image, look it up and return a brief explanation with [number] sources. When I right-click a page section, summarize the article in [number] bullets and point out the main claim plus any weak spots. Before you send, delete, submit, or make any other irreversible change, stop and ask for my approval.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on reddit.com โ†—

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