Semantic security analysis for browser extensions
ES ExtensionSafe

Know what an extension does before you install it.

Paste a Chrome Web Store or Firefox Add-ons link. ExtensionSafe looks past the store listing and reads the actual code to explain what the extension really does—and what that means for your security and privacy.

Chrome · Firefox Check an extension

Copy the extension’s Chrome Web Store or Firefox Add-ons address and paste it below.

We download the published version directly from Google or Mozilla. Extension code is inspected, never run.

See the security questions ExtensionSafe asks
    AnalyzingStarting…

    Case study

    Static analyzers scored it 93/100. The code tells another story.

    MyBib accepts remote browsing jobs, opens server-selected pages, and sends their contents back. See why checking permissions alone missed the important part.

    Read the evidence-based comparison →

    Pricing

    Easy checkout, no login. Public reports stay free. Pay only when you want to skip the free queue.

    Free

    Look before you install

    $0
    • Unlimited cached report views
    • Fresh scans in the free queue
    • Public, shareable reports
    • No account required
    Scan an extension
    Scan Pack

    More answers, no subscription

    $5 one time
    • 5 premium extension scans
    • 25 custom security questions
    • Skip the free queue
    • Credits never expire

    Checking your credits…

    Back up or restore a pack

    Your private pack key keeps your credits available if you change browsers. Anyone with it can use them.

    Scan Pack activated

    Back up your private key

    There is no ExtensionSafe login. Your scans and custom questions are attached to a private key saved in this browser.

    Your private pack key

    Save it somewhere private. If you clear your browser data or change devices, restore this key to recover your credits. Anyone with the key can use them, so don’t share it publicly.