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Micro-SaaS Vetting

The 5 minute security check for browser add-ons

Browser add-ons often have a reputation for being "small"—a quick install for a tiny productivity boost. In reality, a browser extension is more like a micro-vendor sitting inside your browser session. It can see what you see, interact with your pages, and often access the same cloud apps your business runs on. This is why a security check matters. It isn’t about blocking every add-on; it’s about ensuring one over-privileged update doesn’t turn a "helpful helper" into a major data leak.

Why extensions are a high leverage risk

Extensions live where your staff work all day. Because they are granted "special authorisations," they can often read and modify everything in a browser tab—capturing form data, viewing browsing history, or accessing sensitive cloud tools. The risk is twofold: permissions overreach (asking for more data than required) and change over time (a safe extension today can be sold to a malicious developer tomorrow).

The 5-minute extension security check

Use this repeatable process to vet extensions without creating an IT bottleneck:

1. Vet the Developer like a Vendor

If you wouldn't give a random supplier access to your customer records, don't give a random extension access to your browser.

  • Check: Does the developer have a professional website and a clear track record?
  • Source: Only use official stores (Chrome Web Store, Microsoft Edge Add-ons) rather than manual downloads.

2. Treat the description as a contract

The store listing should be a mini-disclosure. It must clearly explain what the tool does and exactly why it needs specific data. Look out for any mention of "analytics" or "data sharing" that doesn't match the core feature.

3. The permission sanity check

This is the most critical step. Microsoft and Google both state that extensions must only request permissions essential for their function.

  • Red Flag: Does a simple "dark mode" tool really need to "read and change all your data on all websites"? If the permission doesn't match the feature, don't install it.

4. Monitor "permission creep"

Extensions update automatically. If an add-on suddenly requests new, broader permissions, treat it with suspicion. It is often safer to uninstall the tool than to grant unexplained access.

5. Decide: approve, avoid, or escalate

  • Approve: Credible vendor, clear purpose, and tight permissions.
  • Avoid: Vague descriptions or "just in case" access requests.
  • Escalate: If a tool is genuinely useful but requires broad access to sensitive systems, have IT review it and add it to a formal "allowlist".

From "quick Install" to managed standard

Unvetted extensions are a hidden vulnerability. By standardising how your team installs them, you turn impulse decisions into clear security standards. Focus on reducing extension sprawl, treating permission changes as red flags, and using browser-level controls to enforce safety by default. Contact us today

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BitDefender
Microsoft 365
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Veeam
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Cyber Essentials
MSP
Watch Guard
Datto
Huntress
Dell Technologies
Hyper-V
BitDefender
Microsoft 365
3CX
Veeam
Signable
Cyber Essentials
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