Why Your Browser Knows More Than You Think

Your browser is the window through which most of your online life happens. It remembers where you have been, what you searched for, which buttons you hovered over and, in many cases, roughly where you were sitting when you did it. That information is valuable, and a great deal of it is quietly shared with advertising networks, analytics firms and data brokers you have never heard of.

None of this means you should panic or retreat to a cave. It does mean that a twenty-minute tidy-up of your browser settings can meaningfully reduce how much you are profiled. The good news is that the controls already exist on your machine, they are free, and you do not need to be technical to use them well.

Cookies: Sort the Helpful from the Hungry

Cookies are small text files a website stores in your browser. Some are genuinely useful: they keep you logged in, remember your basket, and save your language preference. Others, usually set by third parties rather than the site you are visiting, follow you from page to page and build a picture of your interests over months.

Open your browser's settings and look for the privacy or cookies section. You will typically find three broad options:

• Allow all cookies – the most convenient and the least private. Best avoided on a shared or work machine.
• Block third-party cookies – a sensible default for most people. Site logins and baskets keep working; cross-site tracking gets much harder.
• Block all cookies – very private, but expect to log in constantly and for some sites to break entirely.

For everyday use, blocking third-party cookies is the sweet spot. You can also clear existing cookies from the same screen; doing this once will sign you out of most sites, so save it for a moment when you have your passwords to hand.

Turn On Tracking Protection and Do Not Track

Modern browsers include a tracking protection feature, sometimes called "strict" or "enhanced" mode. It works by maintaining a list of known tracking scripts and blocking them before they load. In practice, pages often feel faster as well as more private, because you are no longer downloading a dozen invisible advertising scripts with every article.

Switch it on and set it to the strict or standard level, then spend a week browsing normally. If a site misbehaves, most browsers let you pause protection for that one site with a click, which is far better than turning the whole feature off.

You will also see a "Do Not Track" option. Be realistic about it: it sends a polite request that many sites simply ignore. Enable it anyway, but treat tracking protection as the feature doing the real work.

Check What Your Extensions Can Actually See

Extensions are the most overlooked privacy risk on most computers. When you install one, you often grant it permission to read and change data on every site you visit. A shopping voucher tool, a PDF converter or a "free" weather add-on can therefore see your banking pages, your webmail and your search history.

Open your extensions or add-ons page and go through the list honestly. For each one, ask three questions:

• Do I still use it? If not, remove it. Unused extensions are pure risk.
• Does it need access to all sites, or just one? Many browsers let you restrict an extension to a single site or to "on click" only.
• Is its publisher recognisable? If you cannot remember installing it, that is a strong hint to remove it.

Aim for three or four extensions at most. Fewer add-ons means fewer permissions to audit and fewer ways for something to go wrong after an update.

Sensible Habits Beyond the Settings Menu

Settings only take you so far. A few habits close the remaining gaps without making browsing feel like a chore.

• Use private or incognito windows for one-off searches – it will not hide you from your employer or your broadband provider, but it stops the session being saved locally.
• Review site permissions – camera, microphone, location and notifications. Switch them to "ask" rather than "allow" so nothing turns on behind your back.
• Be wary of "accept all" buttons on cookie banners. Look for the manage or reject option; it is usually there, just less prominent.
• Keep the browser updated – privacy fixes arrive through updates, and so do security patches.

Make It a Twice-a-Year Job

You do not need to think about any of this every week. Set a reminder for twice a year, perhaps when the clocks change, and spend fifteen minutes doing the rounds: clear old cookies, re-check your extension list, confirm tracking protection is still on, and review any site permissions you have granted since last time.

That small routine is enough to keep unwanted profiling at arm's length, and it leaves you free to get on with the actual business of using your computer. If something on your own machine still feels off, that is a good moment to ask someone you trust to look at the settings with you rather than guessing.