AI extension data collection explained: what your Chrome AI tools can really access

Your AI writing assistant just watched you type your bank password. Not because it's malicious — but because the permissions you granted it technically allow exactly that.

A 2026 study by Incogni analyzed 442 AI-powered Chrome extensions and found that 52% collect user data. Nearly a third collect personally identifiable information. And 42% request scripting permissions — the kind that let an extension read and modify everything on your screen.

That's potentially 92 million users whose browser activity is accessible to AI tools they installed for convenience. Here's what that actually means and how to figure out if your extensions are among them.

What "data collection" means for AI extensions

When an AI extension says it "collects data," that phrase covers a surprisingly wide range. At the mild end, it might mean the extension logs basic usage stats — how often you open it, which features you click. Standard stuff.

At the other end, it means the extension is reading the text you type, the pages you visit, and sometimes even your location data. For AI writing tools specifically, they need to see your text to function. That's the catch: the same access that lets a grammar checker fix your comma splice also lets it read your private messages, your medical searches, and your internal work conversations.

The Incogni study found that the most commonly collected data types were website content (31.4% of extensions) and PII (29.2%). That's not metadata. That's the actual content on your screen.

What scripting permissions actually allow

The scripting permission is the big one. When an AI extension has scripting access, it can inject JavaScript into any web page you visit. In practical terms, that means it can:

• Read everything on the page — text, form fields, images, links
• Modify page content — change what you see, inject new elements
• Capture your input — keystrokes, clicks, form submissions
• Access data in real time — as you type, as you browse

The activeTab permission is a lighter alternative. It only activates when you explicitly click the extension, and access disappears when you navigate away or close the tab. That's a much safer design.

But according to the Incogni study, 42% of the AI extensions they analyzed go beyond activeTab and request full scripting access. Why? Because most AI tools need to work passively — fixing your grammar as you type, summarizing pages as you browse. That passive behavior requires persistent access, not the click-to-activate model.

Which categories collect the most

Not all AI extensions are equal when it comes to privacy risk. According to the Incogni 2026 study as reported by Help Net Security, programming and mathematical helper extensions posed the greatest average privacy risk, due to higher numbers of sensitive permissions and more aggressive data collection practices.

Meeting assistants and audio transcribers ranked second — they collect more raw data but request fewer sensitive permissions overall. Writing assistants came in third, followed by personal assistants and general-purpose AI tools. Translators, information lookup tools, and summarizers clustered at the lower end.

Among extensions with over 2 million downloads, the study ranked Grammarly and QuillBot as the most potentially privacy-impacting, according to Incogni's composite risk methodology. The study reported that both extensions collect personal communications, location data, and website content while requiring scripting and activeTab permissions.

It's worth noting that a high privacy risk score in Incogni's methodology doesn't mean an extension is being misused. Both Grammarly and QuillBot have low risk-likelihood scores according to independent Chrome-Stats data, suggesting they're not currently being exploited. The concern is about capability, not intent — these tools can access a lot of your data because their core functionality requires it. Neither Grammarly nor QuillBot has publicly responded to these specific findings as of February 2026.

When broad access is fine — and when it's not

Here's the nuance that most privacy coverage skips: some data collection is completely necessary for the tool to work.

A grammar checker that can't read your text is useless. A meeting transcriber that can't access audio is pointless. The question isn't whether these extensions access data — it's whether they access more than they need, how they store it, and who they share it with.

Reasonable access looks like:

• Writing tools reading text on the active page
• Translators accessing selected text
• Summarizers reading article content

Worth questioning:

• Any AI extension collecting location data (why does a grammar tool need your GPS coordinates?)
• Extensions collecting data even when you're not actively using them
• Tools that don't disclose their data retention policies

The 10 extensions the Incogni study identified as both high risk-likelihood and high risk-impact are the ones that deserve genuine scrutiny. For the big-name tools with low risk-likelihood scores, the concern is more about the principle: do you trust this company with this level of access indefinitely?

How to check your AI extensions right now

You don't need to read privacy policies (though you probably should). Here's the practical approach:

1. Review your extension list. Open chrome://extensions and look at every AI-powered tool you've installed. If you haven't used one in a month, remove it.

2. Check declared permissions. Click "Details" on any extension and scroll to "Permissions." If you see "Read and change all your data on all websites," that's full scripting access.

3. Look at the Chrome Web Store listing. Scroll to "Privacy practices" — developers are required to disclose what data they collect. If the section is empty or suspiciously vague, that's a red flag.

4. Use a scanning tool. Extenshi's catalog breaks down each extension's permissions and data practices into a readable security report. You can check your permissions across all your installed extensions at once — it takes about a minute.

5. Consider alternatives. If an AI tool requests more permissions than similar tools in the same category, switch. There are usually lighter alternatives that get the job done with less access.

The AI extension market nearly doubled in a year — Incogni found 442 AI extensions in January 2026 compared to 238 the year before. That growth is great for productivity. It also means more software with deep access to your browser. Knowing what you've granted is the first step to deciding whether you're okay with it.

Check your AI extension permissions →

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This article is based on publicly available security research and news reporting. Extenshi does not independently verify all claims made by third-party researchers. References to specific companies or products reflect the findings of cited sources and do not constitute accusations of intentional wrongdoing. If you believe any information is inaccurate, please contact us at [email protected].