誰もが今すぐ変更すべき 5 つのブラウザ設定
2026 年 6 月 24 日 · 2 分で読みました · コメント
ほとんどのブラウザには、ユーザーよりも広告主を優先する設定が付属しています。これら 5 つの変更は 5 分もかからず、ほとんどの Web サイトがユーザーの行動すべてを追跡するのを静かに停止します。
1. サードパーティの Cookie をブロックする
- Third-party cookies are placed by advertisers on sites you visit, then read by those same advertisers on every other site you go to. This is how a shoe ad follows you around the internet.
- Chrome: Settings → Privacy and Security → Cookies → Block third-party cookies.
- Firefox: Settings → Privacy & Security → Enhanced Tracking Protection → Strict.
2. DNS-over-HTTPS をオンにする
- Every time you type a web address, your browser asks a DNS server to translate it into an IP address. By default, this request is sent in plain text — meaning your internet provider (and anyone on the same network) can see every site you visit.
- DNS-over-HTTPS encrypts that lookup so it's unreadable to anyone in the middle.
- Chrome: Settings → Privacy and Security → Security → Use secure DNS → With: Cloudflare (1.1.1.1).
3. HTTPS 専用モードを有効にする
- HTTPS encrypts the connection between your browser and the website. HTTP does not. On a plain HTTP site, anyone sharing your Wi-Fi can read exactly what you send and receive.
- Firefox: Settings → Privacy & Security → HTTPS-Only Mode → Enable in all windows.
- Chrome: Settings → Privacy and Security → Security → Always use secure connections.
4. 位置情報、カメラ、マイクの許可を取り消す
- Websites you visited months ago may still have permanent access to your location or camera. Most never need it again.
- Chrome: Settings → Privacy and Security → Site Settings → review Location, Camera, Microphone. Revoke anything you don't recognise.
- Set the default for each to "Ask before accessing" rather than "Allow".
5.「使用状況統計の送信」をオフにする
- Chrome and Edge send usage data and crash reports back to Google and Microsoft by default. This includes URLs of pages you visit and diagnostic information about your activity.
- Chrome: Settings → Privacy and Security → toggle off "Help improve Chrome's features and performance".
- Edge: Settings → Privacy, search, and services → toggle off all diagnostic data options.
これら 5 つの変更により、オンラインであなたが見えなくなるわけではありませんが、最も一般的で侵襲的な形式の追跡が無料で 5 分以内に停止されます。
