Emsisoft Browser Security review

Emsisoft Browser Security does one job with as little as possible. It blocks websites that distribute malware and stops phishing pages that try to steal passwords, and Emsisoft says it uses privacy-conscious technology that does not collect your browsing activity data. That is a real difference from reputation extensions that send each page address to a server, and the Chrome Web Store listing backs it up with a declaration that the developer will not collect or use your data. The extension is tiny, around 99 KB, and keeps its own exclusions list, which your browser syncs across devices when you are signed in. It works without Emsisoft Anti-Malware and runs in Chrome, Firefox, Edge and other Chromium browsers. The limits are clear too: there are no search result ratings, no download scanning and no ad blocking, and the Chrome version was last updated in September 2023, so it may not see as much ongoing work as rivals.

Who it is for

Privacy-minded users who want a tiny blocker that does not send their browsing history to a vendor.

Price

Free; no paid version of the extension.

Emsisoft Browser Security can be obtained free of charge from the extension stores
Quoted from the vendor pricing page on November 11, 2026.

Key features

• Blocks websites that distribute malware
• Prevents phishing attacks that try to steal passwords
• Does not collect your browsing activity data
• Own exclusions list, synced by your browser across devices
• Works independently of Emsisoft Anti-Malware

Strengths and weaknesses

• Strength: Strongest privacy stance in this list
• Strength: Very small, at about 99 KB on the Chrome Web Store
• Strength: Works in Chrome, Firefox, Edge and other Chromium browsers
• Weakness: Chrome version last updated in September 2023
• Weakness: No search result ratings, download scanning or ad blocking
• Weakness: Fewest features of the free options

Key facts

• Price: Free
• Browsers: Chrome, Firefox, Edge, other Chromium browsers
• Size: 99.12 KiB (Chrome Web Store)
• Data collection: None declared

Where it ranks

Emsisoft Browser Security is No. 7 in our Best Browser Security Extensions verdict.