{
  "slug": "firefox",
  "name": "Firefox",
  "maker": "Mozilla",
  "category": "browsers",
  "verdict": "y",
  "answer": "Yes. Only you can read the bookmarks, history, passwords and tabs Firefox Sync stores, because they're sealed before they leave your browser. Firefox also tries a secure connection to every site first.",
  "title": "Is Firefox encrypted? Firefox Sync and HTTPS",
  "description": "Only you can read what Firefox Sync stores: bookmarks, history, passwords and tabs are sealed in your browser first. Checked at the source.",
  "parts": [
    {
      "key": "globe",
      "status": "y",
      "words": "Only you and the site",
      "note": "Since Firefox 136 for computers, Firefox loads pages over a secure connection when it can and falls back only if a site has none.",
      "sources": [
        3
      ],
      "label": "Connection to sites"
    },
    {
      "key": "pass",
      "status": "y",
      "words": "Only you",
      "note": "Sealed in your browser before it syncs, and Mozilla says it can't decrypt it.",
      "sources": [
        1,
        2
      ],
      "label": "Saved passwords"
    },
    {
      "key": "hist",
      "status": "y",
      "words": "Only you",
      "note": "History and open tabs are sealed the same way.",
      "sources": [
        1
      ],
      "label": "History and open tabs"
    },
    {
      "key": "mark",
      "status": "y",
      "words": "Only you",
      "note": "Bookmarks are sealed the same way.",
      "sources": [
        1
      ],
      "label": "Bookmarks"
    }
  ],
  "extra_parts": [],
  "keys": "Your devices, using a key made from your Mozilla account password. Mozilla never has it.",
  "can_see": "Your email address, how many devices you sync and what kinds, and technical details like your browser version and rough location from your IP address.",
  "business": null,
  "fix": null,
  "fix_line": null,
  "sections": [
    {
      "id": "is-firefox-sync-encrypted",
      "q": "Is Firefox Sync end-to-end encrypted?",
      "a": "Yes. Mozilla's privacy notice says your synced data is encrypted before it leaves your browser, and only another browser on your sync account can decrypt it [1]. That covers tabs, passwords, bookmarks, history, add-ons, saved form details and settings [1].\n\nThe key is made from your account password on your own device, and Mozilla says that key never leaves it [2]."
    },
    {
      "id": "can-mozilla-see-my-passwords",
      "q": "Can Mozilla see my Firefox passwords?",
      "a": "No. Mozilla says it can't decrypt anything you sync [1]. What it does keep is your email address and some details about your devices, like how many you have and what kinds, so you can spot and remove one you don't recognize [1][2]."
    },
    {
      "id": "does-firefox-use-https-by-default",
      "q": "Does Firefox use HTTPS by default?",
      "a": "Yes. Since version 136 for computers, released in March 2025, Firefox tries to load every page over a secure connection first [3]. If a site doesn't offer one, Firefox falls back to an unsecured connection so the page still opens [3]."
    }
  ],
  "sources": [
    {
      "title": "Mozilla Accounts Privacy Notice",
      "publisher": "Mozilla",
      "url": "https://www.mozilla.org/en-US/privacy/mozilla-accounts/",
      "read": "2026-10-25"
    },
    {
      "title": "Private by Design: How we built Firefox Sync",
      "publisher": "Mozilla",
      "url": "https://hacks.mozilla.org/2018/11/firefox-sync-privacy/",
      "read": "2026-10-25"
    },
    {
      "title": "Firefox 136.0 release notes",
      "publisher": "Mozilla",
      "url": "https://www.firefox.com/en-US/firefox/136.0/releasenotes/",
      "read": "2026-10-25"
    }
  ],
  "changes": [
    {
      "date": "2026-10-25",
      "text": "First published."
    }
  ],
  "related": [
    "chrome",
    "safari",
    "edge",
    "brave"
  ],
  "url": "https://isitencrypted.com/firefox/",
  "checked": "2026-10-25"
}