Glossary

Chrome Extension

A Chrome extension is a small software program, built with web technologies like HTML, CSS, and JavaScript, that adds features or changes behavior in the Google Chrome browser. Extensions run inside Chrome, integrate with pages you visit, and are installed from the Chrome Web Store.

What is a chrome extension?

A Chrome extension is a lightweight program that extends what the Chrome browser can do. Instead of being a standalone app you open on its own, an extension lives inside Chrome — it can add a button to the toolbar, change how a webpage looks, block content, fill in forms, capture what's on screen, or talk to other services in the background.

Extensions are built with the same web technologies as websites — HTML, CSS, and JavaScript — plus a set of Chrome-specific APIs that let them read tabs, respond to clicks, store data, and inject scripts into pages. Because they're built on web standards, most Chrome extensions also run on other Chromium-based browsers like Microsoft Edge, Brave, and Opera with little or no change.

You install extensions from the Chrome Web Store, Google's official directory. Each extension declares the permissions it needs — for example, the ability to read the current tab or capture the screen — and Chrome shows you those permissions before you install. That permission model is what makes extensions powerful and what makes it worth paying attention to which ones you trust.

Key characteristics

Built on web technologies

Extensions use HTML, CSS, and JavaScript plus Chrome's extension APIs. There's no separate language to learn — anyone who can build a webpage can build an extension.

Installed from the Chrome Web Store

The Web Store is Google's reviewed directory. Extensions can also be loaded manually by developers, but the vast majority of users install from the store with one click.

Permission-scoped

Every extension declares exactly what it can access — specific sites, all tabs, the clipboard, screen capture — and Chrome surfaces those permissions before install and in settings.

Runs inside the browser

Extensions act on the pages you're already on. They can add a toolbar button, a popup, a side panel, or quietly modify a page in place — no separate window required.

Auto-updating

Chrome keeps extensions current in the background, so security fixes and new features arrive without the user reinstalling anything.

Chrome Extension examples

Documentation and workflow capture

Extensions like Glyde, Scribe, and Tango watch what you do in a browser-based tool and turn it into a step-by-step guide — capturing screenshots, clicks, and page context, then writing the instructions for you. This is one of the most common productivity uses of an extension.

Password managers

Tools like 1Password and Bitwarden add a toolbar button that autofills logins, generates strong passwords, and syncs credentials across sites — all without leaving the page you're on.

Content and ad blockers

Extensions such as uBlock Origin modify pages as they load to hide ads, trackers, and clutter. They're a clear example of an extension changing a webpage in place.

Chrome extension vs browser plugin

People use "extension" and "plugin" interchangeably, but they're different things — and browser plugins are effectively obsolete.

	Chrome extension	Browser plugin
What it is	A program that extends the browser itself using web technologies	A separate component (e.g. Flash, Java, Silverlight) that renders specific content types inside pages
Built with	HTML, CSS, JavaScript + Chrome APIs	Native code via legacy plugin interfaces (NPAPI/PPAPI)
How it's installed	One click from the Chrome Web Store	Downloaded and installed at the system level
Security model	Sandboxed, permission-scoped, auto-updated	Broad system access, a frequent source of vulnerabilities
Status today	Actively supported and expanding	Deprecated — modern Chrome no longer supports classic plugins

How to install a Chrome extension

1Open the Chrome Web Store at chromewebstore.google.com and search for the extension by name.
2Open the extension's listing and review its description, rating, number of users, and — importantly — the permissions it requests.
3Click "Add to Chrome," then confirm in the dialog that lists what the extension will be able to access.
4Pin the extension to your toolbar (click the puzzle-piece icon, then the pin) so its button is always visible.
5Manage or remove extensions anytime at chrome://extensions, where you can toggle each one off or delete it.

Chrome extension security considerations

Extensions are useful precisely because they can see and act on the pages you visit — which is also why permissions matter. An extension that requests the ability to "read and change all your data on all websites" can, in principle, see everything you do in the browser. That's fine for a trusted tool that genuinely needs it, but it's worth a second look for anything you don't recognize.

A few habits keep you safe: install from the Chrome Web Store rather than random links, check the developer and review count before installing, prefer extensions that request the narrowest permissions they need, and periodically audit chrome://extensions to remove anything you no longer use. For anything that captures your screen or handles sensitive data, favor tools that are explicit about what they store and offer redaction of personal information.

How Glyde uses a Chrome extension

Glyde is a Chrome extension that turns screen recordings into polished SOPs. You install it from the Chrome Web Store, pin it to your toolbar, and hit record before running a process in any browser-based tool — a CRM, an admin panel, a support queue. As you work, Glyde captures the screenshots, clicks, and on-page context, then writes a structured guide with purpose, prerequisites, and annotated steps.

Because it runs inside the browser, there's nothing to set up beyond the extension itself, and the guide is ready the moment you stop recording — no manual screenshotting or pasting into a doc. Glyde also redacts personal information from captures, so sensitive data doesn't end up in your documentation. It's a concrete example of the documentation-capture category of extension: the browser is where the work happens, so the browser is where the guide gets made.

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FAQ

Chrome Extension, answered

What is a Chrome extension in simple terms?

It's a small add-on that gives the Chrome browser extra abilities — like blocking ads, saving passwords, or turning what you do on screen into a step-by-step guide. You install it from the Chrome Web Store, and it works inside Chrome without needing a separate app.

Are Chrome extensions safe?

Extensions from the Chrome Web Store are reviewed and run in a sandbox, so they're generally safe — but each one requests permissions, and some can read the pages you visit. Install from the official store, check the developer and reviews, and remove extensions you don't use. Favor tools that request only the permissions they need.

Do Chrome extensions work on other browsers?

Usually, yes. Chrome extensions are built on web standards, so most also run on Chromium-based browsers like Microsoft Edge, Brave, and Opera, often installable directly from the Chrome Web Store. They don't run on Safari, which uses a different extension system.

How much do Chrome extensions cost?

Many are free. Others follow a freemium model — free to install with paid plans for advanced features or team use. The Chrome Web Store itself is free to browse and install from.

What's the difference between a Chrome extension and an app?

An extension lives inside the browser and acts on the pages you're already viewing. An app is a standalone program you open on its own. Extensions are the right fit when the job happens in the browser — like capturing a web-based workflow into documentation.

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