On the surface, the two extensions identified by Ox Security researchers look pretty benign. The first, named "Chat GPT for Chrome with GPT-5, Claude Sonnet & DeepSeek AI," has a Featured badge and 2.7K ratings with over 600,000 users. "AI Sidebar with Deepseek, ChatGPT, Claude and more" appears verified and has 2.2K ratings with 300,000 users.
Researchers found that the extensions impersonate legitimate Chrome add-ons developed by AITOPIA that add a sidebar to any website with the ability to chat with popular LLMs. The malicious capabilities stem from a request for consent for “anonymous, non-identifiable analytics data." Threat actors are using Lovable, a web development platform, to host privacy policies and infrastructure, obscuring their processes.
How to avoid malicious browser add-ons
If you've added AI-related extensions to Chrome, go to chrome://extensions/ and look for the malicious impersonators. Hit Remove if you find them. As of this writing, the extensions identified by Ox no longer appear in the Chrome Web Store.
To minimize risk, you should always vet browser extensions carefully (even those that appear legit) for obvious red flags, like misspellings in the description and a large number of positive reviews accumulated in a short time. Head to Google or Reddit to see if anyone has identified the add-on as malicious or found any issues with the developer or source. Make sure you're downloading the right extension—threat actors often try to confuse users with names that appear similar to popular add-ons.
Finally, you should regularly audit your extensions and remove those that aren't essential. Go to chrome://extensions/ to see everything you have installed.
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