Useful Browser Extensions, and How to Choose Them Safely

Browser extensions can block trackers, manage passwords and save you time. Because they can read and change the pages you visit, they deserve the same scrutiny as any software.

Categories worth considering

• Password manager extensions fill in unique passwords and help spot fake login pages.
• Content and tracker blockers reduce tracking scripts and can speed up pages.
• Reading and note-taking tools save articles and highlights.
• Developer tools help inspect performance and accessibility; useful alongside Website Performance Optimization Fundamentals.

Safety checklist

1. Install from the official browser store.
2. Read the permissions. "Read and change all your data on all websites" is a lot of access.
3. Check the publisher and how recently the extension was updated.
4. Keep the number small. Every extension adds risk and can slow your browser.
5. Review periodically and remove what you no longer use.

A note on ownership changes

Popular extensions are sometimes sold to new owners. If an extension suddenly requests new permissions, reconsider whether to keep it.

For more low-cost tools, see Free Tools for Digital Creators.

Why extensions deserve extra caution

Browser extensions can be remarkably useful, but they run inside the most sensitive app on your computer. Depending on the permissions you grant, an extension may be able to read and change the content of every page you visit, including your email, banking and work tools. Most extensions are legitimate, but the permission model means a single bad or compromised extension can do real damage. That is why choosing them deserves the same care as installing software.

Understand the permission prompts

When you install an extension, Chrome, Edge, Firefox and Safari show the permissions it requests. Pay attention to phrases such as:

• "Read and change all your data on all websites": the broadest access. Reasonable for an ad blocker or password manager, which need it to work, but suspicious for a simple tool like a color picker or a tab counter.
• "Read your browsing history": needed by few extensions.
• "Manage your downloads" or "Communicate with cooperating native applications": legitimate for some tools, but worth questioning.

Many browsers now let you limit an extension to specific sites or to run only when you click it. In Chrome and Edge, open the extension's details and change "Site access" to "On click" or "On specific sites." Firefox and Safari offer similar controls. This one setting dramatically reduces risk for extensions you only use occasionally.

Signs of a trustworthy extension

• A known publisher. Extensions from established companies or well-known open-source projects, with a clear website and privacy policy.
• Active maintenance. A recent update date and a changelog. Abandoned extensions are more likely to be sold to new owners.
• A clear business model. If an extension is free, closed-source and has no obvious way to make money, ask how it pays for itself.
• Reasonable reviews over time. Look at recent reviews, not just the average rating, since problems often appear after an ownership change.
• Open-source code, for privacy-sensitive tools, so independent developers can inspect it.

Red flags

• Extensions that redirect your searches to an unfamiliar search engine or change your home page.
• New toolbars, pop-ups or ads that appear on sites that did not show them before.
• Extensions installed alongside other software that you do not remember choosing.
• "Free VPN," "video downloader" and "coupon" extensions from unknown publishers, categories that have repeatedly been used for data collection or adware.
• Requests for broad permissions after an update, which Chrome may flag by disabling the extension until you approve.

A twice-yearly extension cleanup

1. Open your browser's extensions page (chrome://extensions, edge://extensions, about:addons in Firefox, or Safari's Settings > Extensions).
2. Remove anything you have not used in the last few months.
3. For each remaining extension, check its site access and restrict it where possible.
4. Look up any extension you do not recognize before deciding whether to keep it.
5. Make sure your browser itself is up to date, since browser updates also fix security problems.

Extensions at work

If you use a work computer, your employer may restrict which extensions you can install, or manage them centrally. Follow those rules. Avoid installing personal extensions on a work profile, and never install extensions that capture page content, such as AI assistants or screenshot tools, on systems containing confidential client or health information without approval. Using separate browser profiles for work and personal use keeps extensions, cookies and saved passwords apart.

A short, sensible starter set

For most people, a small set covers the essentials: the browser extension for your password manager, a reputable content blocker, and perhaps one productivity tool you use daily. Each extension you add increases the attack surface, so fewer, well-chosen extensions are usually better than many.

What to do if you suspect a bad extension

If your browser starts behaving strangely, act quickly. Remove the suspicious extension, then check your browser settings for changed search engines, home pages or startup pages and reset them. Clear cookies for important sites and sign out of all sessions from your email and banking security pages. Change passwords for any accounts you used while the extension was installed, starting with email, and make sure two-factor authentication is on. If the extension came bundled with other software, uninstall that software too, and run your operating system's built-in security scan, such as Microsoft Defender on Windows.

The bottom line

Treat extensions like apps with access to everything you do online. Install from official stores, prefer known and actively maintained publishers, restrict site access, and remove what you no longer use. A few minutes of cleanup twice a year keeps a useful tool from becoming a privacy problem.