I Reviewed Every Browser Extension My Team Uses Once a Month and That Habit Probably Prevented Our Next Account Takeover

I Reviewed Every Browser Extension My Team Uses Once a Month and That Habit Probably Prevented Our Next Account Takeover

Last month one of our shared admin accounts started behaving strangely. Nobody lost access, nothing was stolen, and there was no dramatic ransomware note. But a browser session kept expiring early, an internal dashboard opened a new tab we did not expect, and one teammate noticed an extension requesting permissions that had nothing to do with its advertised feature.

That was enough to trigger our usual monthly browser extension audit. It took less than 25 minutes. We removed four extensions, downgraded permissions on two more, and replaced one abandoned add-on with a better maintained alternative. I am convinced that routine probably saved us from the kind of quiet account takeover that only becomes obvious after damage is already done.

If you only do one security cleanup this month, make it this one. Browser extensions sit close to your passwords, sessions, tabs, clipboard, search traffic, and sometimes your email. They are helpful, but they also have an absurd amount of power.

Why browser extensions are still such a soft target

Most people think about malware as a fake invoice, a phishing link, or a malicious download. They do not think about the coupon finder, AI summarizer, grammar helper, screenshot tool, or PDF converter living inside the same browser that accesses payroll, banking, and admin panels.

But extensions often request the ability to read and change data on websites you visit. That can include login pages, webmail, CRMs, and cloud dashboards. If the vendor gets compromised, sells the product, stops maintaining it, or slips in new tracking behavior, your exposure changes overnight.

That is why this belongs in the same family of hygiene as our passkeys rollout guide and our warning on small-business crypto deadlines. You are not looking for a perfect stack. You are shrinking unnecessary attack surface.

The 7-step monthly browser extension audit checklist

1. Export or screenshot the full extension list

Do not trust memory. Open the browser extensions page and document every installed add-on on every work browser you actually use. Personal Chrome profile, work Edge profile, shared admin profile, all of it.

2. Remove anything unused for the last 30 days

If nobody can explain why an extension is still installed, uninstall it. Convenience is not a security justification.

3. Review permissions one by one

Be especially careful with permissions like Read and change all your data on all websites, clipboard access, downloads, browsing history, and access on banking or admin domains. If the permission is broader than the feature, that is your first red flag.

4. Check publisher credibility

Look for a real company site, recent updates, a privacy policy, and a support page that still exists. An abandoned extension with powerful permissions should be treated as hostile until proven otherwise.

5. Read the latest reviews, not just the star rating

The most useful clues are often in recent one-star reviews mentioning sudden ads, broken behavior, suspicious redirects, or a new owner after an acquisition.

6. Restrict site access where the browser allows it

Some extensions can be limited to specific sites or to click-to-activate mode. Use that. A tool that only needs Google Docs should not monitor every page you visit.

7. Replace risky utilities with built-in browser features

The safest extension is often no extension. Modern browsers already handle screenshots, tab grouping, password storage, reading mode, translation, and PDF viewing reasonably well.

The red flags that make me uninstall immediately

• The extension asks for access to every site when the feature does not require it.
• The publisher website is dead, low quality, or impossible to verify.
• The add-on changed ownership and recent reviews mention new ads or tracking.
• There has been no update in a very long time despite changing browser ecosystems.
• The value is trivial, but the permissions are broad.

What I tell small teams to do right now

If you run a small business, give one person ownership of a recurring monthly extension review. Use a simple spreadsheet with four columns: extension name, business purpose, permissions risk, keep or remove. That is enough to create discipline.

Also separate sensitive work from casual browsing. The browser profile that touches finance, admin, or customer data should have the fewest extensions. Your research profile can be messier. Your admin profile cannot.

Bottom line

Browser extension risk is boring, repetitive, and easy to postpone. That is exactly why attackers love it. The monthly audit is not glamorous, but it is one of the cheapest ways to reduce exposure to credential theft and session hijacking.

Sources: Google Chrome extension permission documentation, Mozilla Add-ons policies, CISA guidance on reducing attack surface, and vendor best practices for browser-based identity protection.