VPN Frontier 作者： AgitAngst

What is it?
VPN Frontier is a browser extension that blocks access to Russian domain zones (.ru, .рф, .su, and others) when your IP address is outside Russia. It works at the browser level — requests are intercepted before any connection to the server. No data leaves your browser.

Why?
You're abroad and want to prevent accidental access to Russian websites. Or you want to control which domain zones are accessible from your network. VPN Frontier handles this automatically — no manual proxy or firewall setup needed.

Key Features
🔒 Block-First Architecture
On install, all Russian zones are blocked instantly — before the first IP check. Blocking is lifted only after confirming a real Russian IP address. Zero vulnerability windows.

🌍 10 Selectable IP Check Services
Choose which APIs you trust:

ipapi.co, ipinfo.io, ifconfig.co, ipwho.is, freeipapi.com
ip-api.com, ipdata.co, ipbase.com, ipgeolocation.io, ip2location.io
Toggle each independently. At least one must be active. The extension tries them in order and stops at the first success.

⚡ 6 Configurable Check Triggers
Combine any conditions — each toggles independently:

Trigger Description
Visit to a blocked site IP check on every navigation to .ru etc.
Tab switch Check when switching active tabs
Timer Periodic check (5 / 10 / 15 / 30 / 60 min)
Browser startup Check when Chrome/Firefox starts
Wake from sleep Detects laptop waking from sleep
Return to browser When switching back from another app
🏳️ Dynamic Icon
On .ru sites the extension icon becomes 🇷🇺 Russian flag. On other sites — 🌐 globe.

🌐 Full Bilingual Interface
Russian and English — switch with one RU/EN button. Everything translates: popup, block page, settings, notifications, context menu. Country names display in current language with emoji flag: 🇳🇱 Netherlands (NL).

🔊 Sound Notification
A short two-tone sound plays on block. Generated via Web Audio API — no files needed. Toggle on/off in settings.

📊 Block Statistics
Cards: today / last 7 days / total
Bar chart by day
Top 10 blocked domains
Reset button
🧩 Custom Zones & Whitelist
Add zones: .by, .kz, .ua — any TLD
Whitelist: allow specific sites within blocked zones (e.g., translate.yandex.ru)
Manage via popup, settings page, or context menu (right-click)
💡 Smart VPN Detection
If a Russian VPN is detected — access is not blocked, but a soft warning is shown: "Consider turning off your VPN when you don't need it." Detects by ISP/organization: Kaspersky, Browsec, Yandex, Rostelecom, MTS, and others.

📦 Import / Export
All settings (zones, whitelist, providers, triggers, language, history) export to JSON. Transfer to another computer or share your configuration.

🔄 Sync Across Devices
Settings are stored in chrome.storage.sync — automatically synced across devices via your Google account.

⚙️ Full Settings Page
All settings available not only from the popup but also on a dedicated full-size page. Opens via ⚙️ button or through browser extension settings.