Firefox 148 adds master switch for browser bot bother
The Register
February 25, 2026
AI-Generated Deep Dive Summary
Mozilla's Firefox 148 introduces a groundbreaking feature: a global master switch to disable AI-based functionalities, addressing long-standing concerns about performance and privacy. This update follows months of criticism over the browser's increasing reliance on AI features, which users reported caused excessive CPU usage. While Thunderbird 148 also launched with improvements, including enhanced security for Microsoft Exchange accounts and better authentication methods like NTLM, Firefox remains the star of this release due to its AI-focused changes.
The inclusion of an embedded LLM (Large Language Model) in Firefox has been a contentious issue since version 141. Users complained about the resource-heavy features, such as tab group naming and link summaries, which were rolled out without clear opt-out options. The new master switch allows users to disable all AI features at once, though five secondary switches let them re-enable specific functions like language translation if desired. This granularity gives users control over how much AI they want in their browsing experience.
For tech enthusiasts, this update matters because it represents a rare instance of user empowerment in software development. Mozilla's decision to make AI optional aligns with growing demands for transparency and choice in how technology is used. Additionally, Firefox 148 introduces improved HTML sanitization to block cross-site scripting attacks and offers better telemetry control, allowing users to opt out while still receiving updates. These changes highlight Mozilla's commitment to balancing innovation with user preferences.
Thunderbird users also benefit from this release, with enhanced support for Microsoft Exchange servers and improved security features. The inclusion of NTLM authentication, though an older protocol, ensures compatibility with legacy systems. Meanwhile, Firefox's optional AI switch is a significant step forward for tech enthusiasts seeking to avoid unnecessary resource consumption and maintain control over their browsing experience.
In an era where AI integration is becoming increasingly common in software, Mozilla's approach stands out as user-centric. By offering both global and granular controls, the company not only addresses immediate concerns but also sets a precedent for future updates that prioritize user choice. This release underscores the importance of adaptability and responsiveness in tech development, making Firefox 148 a notable milestone for anyone interested in cutting-edge yet user-friendly browser technology.
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Originally published on The Register on 2/25/2026