Firefox 135 has officially launched, and unsurprisingly, AI integration is now part of the browser experience. Unlike Microsoft Edge’s Copilot or Brave’s Leo AI, Mozilla isn’t developing its own AI model but is instead offering direct access to third-party AI chatbots like Anthropic’s Claude, OpenAI’s ChatGPT, HuggingChat, and Le Chat Mistral.
Initially labeled as an experimental feature and available to only a limited group of users, this AI functionality is now gradually rolling out to all Firefox users. It provides built-in AI chatbot access but does not include any free AI services—users must have their own subscriptions to access premium features. The AI interface can be accessed through the “sparkle” button in the sidebar, where users can also switch between different AI providers via a drop-down menu.
Beyond AI integration, Firefox 135 introduces several practical enhancements. The browser now supports translations for Chinese, Japanese, and Korean, expanding its existing translation capabilities. Additionally, it introduces a history protection feature that prevents websites from abusing the browser’s back button by injecting fake pages—an issue that has long frustrated users on other browsers.
Security improvements are also part of this release, including the enforcement of the CRLite certificate revocation checking mechanism, which enhances certificate transparency by ensuring web servers properly disclose their certificates.
While not everyone is keen on AI in their browser, those who are will find that Firefox now offers a flexible, provider-agnostic approach. For those uninterested in AI, the update still brings a range of valuable security and usability improvements.
