Google’s Chrome browser has come under scrutiny after reports claimed that it automatically downloaded a 4GB AI model onto users’ devices without seeking permission. According to thatprivacyguy, the AI package, identified as Gemini Nano’s weights file, was allegedly installed quietly inside the OptGuideOnDeviceModel directory, consuming significant storage space without any prompt, checkbox, or notification to users.
The report highlights concerns over the sheer scale of the deployment, considering Chrome’s global user base. Critics argue that silently distributing such large AI files across millions of systems could lead to substantial environmental costs, including increased electricity consumption and carbon emissions. The article claims the energy impact may be comparable to “thousands of cars running for an entire year.”
Users attempting to manually remove the weights.bin file reportedly discovered that the browser automatically downloaded it again during the next launch. The repeated installation has raised concerns among privacy advocates, who argue that the software behaves in a persistent manner that overrides user preferences.
The issue appears particularly frustrating for users on different operating systems. Windows users reportedly need to edit system registry settings to permanently disable the feature, while Mac users must navigate through Chrome’s internal flags menu to switch off the on-device optimization setting.
Privacy concerns have also been linked to European regulations. The report references Article 5(3) of the EU’s ePrivacy Directive, which states that storing information on user devices requires “prior, freely-given, specific, informed, and unambiguous consent.” Critics claim Chrome’s alleged silent installation may conflict with these legal requirements.
In addition to privacy implications, the environmental impact of distributing such a large AI model has become another point of debate. Estimates mentioned in the report suggest that global data transfer and repeated downloads could consume enormous amounts of electricity, further increasing the carbon footprint associated with AI-powered browser features.
To disable the feature, Windows users are advised to modify the Registry Editor by creating a DWORD entry named GenAILocalFoundationalModelSettings and assigning it a value of 1. Mac users, meanwhile, can reportedly disable the functionality through the chrome://flags menu by turning off “Enables Optimization Guide On Device.”
The controversy has sparked broader discussions around user consent, digital privacy, and the environmental consequences of large-scale AI deployments integrated into consumer software.
