Extensions on Chromebook are small programs that add features to Chrome without changing the browser itself

A Chromebook extension is a lightweight program that runs inside Chrome and modifies what you see or how the browser works. Extensions live in the top right corner of your screen (in the toolbar) and set up when you need them. Unlike a full process, an extension does not take up storage space the way a program on Windows or Mac does — it sits in Chrome's memory and runs only when you use it or when you set it to run automatically.

Extensions are different from apps. A Chromebook app is a standalone program you launch from your shelf or app drawer. An extension is part of Chrome itself and only works inside the browser. You cannot use an extension outside of Chrome, and you cannot use most Chrome extensions on other browsers.

The most common extensions handle tasks like password management, ad blocking, grammar checking, and video downloading. Some extensions change how websites look. Others add tools to existing websites — for example, an extension might add a calculator button to Gmail or let you save articles to read later.

Key Takeaways

  • Extensions are small programs that live in Chrome and add features without taking up much storage space on your Chromebook.
  • You install extensions from the Chrome Web Store, and they appear as icons in your toolbar that you click to use.
  • Extensions can access your browsing data and the websites you visit, so you should only install ones from sources you trust.
  • You can turn extensions on and off, remove them entirely, or limit what data they can see without uninstalling them.
  • Some extensions slow down Chrome slightly because they run in the background, so removing ones you do not use regularly keeps your Chromebook faster.

Where to find and install extensions

All Chromebook extensions come from the Chrome Web Store, which is Google's official marketplace. You reach it by opening Chrome, clicking the three vertical dots in the top right corner, then selecting "Extensions" and "Open Chrome Web Store." You can also search for "Chrome Web Store" in your address bar.

Once you find an extension you want, click the blue "Add to Chrome" button. Chrome will ask you to confirm by showing what data the extension can access — for example, whether it can see all your browsing history or only work on specific websites. Read this permission screen before you click "Add extension." After installation, the extension's icon appears in your toolbar, usually in the top right corner next to your profile picture.

Not every extension works on every Chromebook. Some extensions require a specific version of Chrome or only work on certain websites. The Chrome Web Store page for each extension lists what it needs to run. If an extension does not appear in the Web Store for you, your Chromebook's version of Chrome may be too old, or the extension may not be available in your region.

What permissions extensions ask for and why

When you install an extension, Chrome shows you a list of permissions — the types of data the extension can access. Common permissions include "read your browsing history," "see all data on websites you visit," or "change settings in Chrome." These permissions exist because some extensions genuinely need that access to work. A password manager needs to see what you type in password fields. An ad blocker needs to see the content of every webpage.

The risk is that an extension with broad permissions could theoretically collect data about you without your knowledge. This is why you should only install extensions from developers you recognize or that have many positive reviews in the Chrome Web Store. Read the reviews and look at the number of users — an extension with 100,000 users and 4.5 stars is safer than an unknown extension with 12 users and no reviews.

You can limit what an extension sees after you install it. Open Chrome's settings, go to "Extensions," find the extension, and click "Details." You can change the permission level from "On all sites" to "On current site only" or "On specific sites." This means the extension only activates when you visit those sites, not everywhere you browse.

How to manage, disable, or remove extensions

To see all your installed extensions, click the three vertical dots in Chrome's top right corner and select "Extensions" and "Manage extensions." This page shows every extension you have installed, whether it is turned on, and how many permissions it has.

To turn an extension off without removing it, click the toggle switch next to its name. The extension stays installed but does not run. This is useful if you want to keep an extension but do not need it right now — turning it off slightly speeds up Chrome because the extension is not using memory.

To remove an extension completely, click the trash icon on its card. Chrome will ask you to confirm. The extension disappears from your toolbar and your Chromebook, and you can reinstall it later from the Chrome Web Store if you change your mind. Removing extensions you do not use regularly is one of the fastest ways to make Chrome run faster on a Chromebook.

Extensions that slow down your Chromebook

Every extension uses a small amount of memory and processing power, even if it is not actively doing anything. If you have many extensions installed, Chrome will run noticeably slower, especially on older Chromebooks with less memory. The slowdown is usually small — you might notice pages load a half-second slower — but it adds up.

Some extensions are heavier than others. Extensions that run in the background constantly (like some email notifiers or stock tickers) use more resources than extensions that only work when you click them. Ad blockers and grammar checkers are moderately heavy because they scan every webpage you visit.

The best practice is to keep only the extensions you actually use. If you installed an extension months ago and never use it, remove it. If you have five ad blockers installed, keep only one. Check your extension list every few months and delete anything you have forgotten about.

Extensions versus Chrome apps and web apps

Chromebooks can run three types of add-ons: extensions, Chrome apps, and web apps. Extensions are the smallest and live in Chrome. Chrome apps are larger programs that you launch from your shelf or app drawer — they are separate from the browser and can work offline. Web apps are websites that you can install as shortcuts on your Chromebook, like Gmail or Google Drive.

Most of the time, you will use extensions for browser features and Chrome apps or web apps for standalone programs. If you want to add a feature to Chrome itself (like a password manager or ad blocker), use an extension. If you want a program that runs independently from the browser, use a Chrome app or web app.

Google has been phasing out Chrome apps in favor of web apps and extensions, so you may see fewer Chrome apps available over time. Extensions remain the primary way to customize Chrome on a Chromebook.

Frequently Asked Questions

Can I use Chrome extensions on other browsers like Firefox or Safari?

No. Extensions are built specifically for Chrome and only work in Chrome. Firefox has its own extension system, and Safari has its own. If you switch browsers, you will need to find equivalent add-ons for that browser. Some popular extensions like password managers exist for multiple browsers, but they are separate versions built for each one.

What should I do if an extension stops working?

First, check that the extension is turned on in your Extensions settings. If it is on, try removing it and reinstalling it from the Chrome Web Store. If it still does not work, the extension may not be compatible with your current version of Chrome — update Chrome by clicking the three dots, going to "About Chrome," and letting it update. If the extension still fails, contact the developer through the Chrome Web Store page.

Can extensions see my passwords and personal information?

Extensions can only access the data you give them permission to see. A password manager extension needs permission to see password fields, but an ad blocker does not. Always read the permissions screen before installing. If an extension asks for more permissions than it should need, do not install it. You can also limit permissions after installation by changing the extension to "On specific sites only."

Do I need antivirus software to protect against malicious extensions?

Chromebooks have built-in security that scans extensions in the Chrome Web Store before they are published. Malicious extensions are rare because Google removes them quickly. Your best protection is to only install extensions from the official Chrome Web Store, read reviews before installing, and remove extensions you do not recognize or use.

Will removing all my extensions make Chrome faster?

Yes, but the speed gain depends on how many extensions you had and how heavy they were. Removing five unused extensions might make pages load noticeably faster on an older Chromebook. On a newer Chromebook with more memory, you may not notice much difference. The best approach is to keep only the extensions you use regularly and remove the rest.