Browser Security: Extensions, Autofill & Safe Settings
By Aisha Khan · · 8 min read
Your browser is the front door to almost everything you do online, so a few sensible settings go a long way. Keep it updated, install only extensions you trust and check their permissions, let autofill work for you on genuine sites but stay alert on unfamiliar ones, and leave the built-in safe-browsing protection switched on. Here is how to do each step.
Keep your browser up to date
The most valuable thing you can do takes almost no effort: run the latest version. Browsers are a prime target, and updates exist largely to patch security flaws that attackers actively try to exploit. When you skip updates, you leave known holes open. Switch on automatic updates, and when the browser prompts you to restart to finish installing one, do it rather than putting it off for days.
Audit your extensions
Extensions are small programs that add features to your browser, and they can be genuinely useful. But each one runs inside your browser with whatever access it was granted, which can be a great deal. A poorly made or malicious extension can read what you type, including passwords, or change pages you visit. The goal is not to avoid extensions, but to be deliberate about them.
How to keep extensions tidy and safe
- Install only what you need, from reputable developers with a track record. More extensions means more risk and more to maintain.
- Read the permissions. If an extension asks to "read and change all your data on the websites you visit", that is powerful access — fine for a trusted tool, but worth pausing over for a novelty one.
- Remove what you no longer use. Open the extensions page every few months and uninstall anything you have forgotten about.
- Be wary of ones that change after install, such as suddenly showing ads or redirecting searches. That is a sign to remove it.
Handle autofill with care
Autofill saves you from typing passwords, card numbers and addresses by hand, and on legitimate sites that is both convenient and safe. A good password manager only offers to fill credentials on the exact site they were saved for, which is actually a quiet security benefit: if you land on a lookalike domain, your manager will not recognise it and will not autofill — a useful hint that something is wrong.
The caution is around untrusted or unfamiliar sites. Never let autofill enter your details on a page you arrived at from a suspicious link or pop-up. And take care with stored card details and addresses, which some browsers will fill into forms automatically; review what your browser has saved and remove anything you would rather not have offered up on every form. When in doubt about whether a page is genuine, our guide on spotting a fake website shows how to read the address first.
Turn on safe browsing
Most modern browsers include a safe-browsing feature that checks the sites you visit against lists of known dangerous or deceptive pages and warns you before they load. It is free, runs in the background, and is a sensible backstop, so leave it on. Treat it as a seatbelt rather than a force field: it catches a lot, but not everything, so keep applying your own judgement alongside it.
A few settings worth a look
- Pop-ups and redirects: keep blocking enabled so rogue pages cannot fling new windows at you.
- Site permissions: review which sites can use your camera, microphone and location, and revoke any you do not recognise.
- Downloads: ask the browser to confirm before downloading, so nothing arrives silently.
- Sign-in and sync: if you sync across devices, protect that account well, since it can carry your saved passwords.
Strong passwords are still the foundation
A locked-down browser protects how you reach your accounts, but the accounts themselves still need strong, unique credentials. Whether you use your browser's built-in password store or a dedicated manager, both beat reusing passwords by a wide margin. Generate new ones with our password generator, and if you suspect an old password is weak, check it in the strength analyser before you replace it. To understand why long credentials matter more than fiddly complex ones, see passwords versus passphrases.
Frequently asked questions
Why does keeping my browser updated matter so much?
Browsers are your main window onto the web and a frequent target. Updates fix security flaws that attackers actively try to exploit, so running the latest version closes those holes. Enable automatic updates and restart the browser when it asks you to.
How do I know if a browser extension is safe?
Install only extensions you genuinely need, from reputable developers, and check the permissions they request. An extension that asks to read and change data on every website you visit is powerful and should be trusted carefully. Remove anything you no longer use.
Is browser password autofill safe to use?
Autofill from a trusted password manager is convenient and generally safe on legitimate sites, because good managers only fill credentials on the exact site they were saved for. Be cautious on unfamiliar or lookalike sites, and never let autofill enter details on a page you reached from a suspicious link.
What is safe browsing and should I turn it on?
Most modern browsers include a safe-browsing feature that warns you before you open a known dangerous or deceptive site. It is a useful free backstop, so leave it switched on. It does not catch everything, so keep applying your own judgement too.
Should I use the browser's built-in password store or a separate manager?
Either is far better than reusing passwords. A dedicated password manager usually offers stronger protection, cross-device syncing and extra features. Whichever you choose, protect it with a strong master password and a second factor.
This article is general online-safety education, not professional security advice.