1Password 7 Legacy Extension v4.7.5 – Manifest V3 Edition Overview This is an unofficial, community-maintained port of the original 1Password Legacy Extension v4.7.5, updated to support Manifest V3 for ongoing compatibility with modern Firefox browsers. Important Notice ⚠️ This extension is NOT officially developed or supported by AgileBits (1Password).

A community preservation project created to maintain the legacy desktop app integration.
A valid 1Password license from AgileBits is still required.
Requires the 1Password Desktop Application (v4.x or compatible standalone version).
This extension simply allows continued use of software you already own.

Why This Extension? When AgileBits discontinued support for the classic 1Password browser extension, many users were left relying on their standalone desktop vaults. This port ensures that those users can continue using their existing software with:

Future compatibility through Manifest V3 compliance
Preserved functionality for standalone desktop licenses
No cloud dependency — fully offline operation

Features Core Functionality ✅ Desktop App Integration

Native messaging connection to the 1Password desktop app
Secure access to local vaults
No cloud or online account required

✅ Auto-Fill & Form Detection

Automatic detection of login forms
One-click username and password filling
Works on all HTTP/HTTPS sites

✅ Browser Integration

Toolbar button for quick access
Context menu options
Keyboard shortcut support
Tab-level security control

✅ Manifest V3 Compliance

Future-proof service worker architecture
Modern permission model
Compatible with Firefox 109.0+

✅ Security & Privacy

Private/incognito mode support
Secure native messaging protocol
No telemetry, analytics, or data collection
All credentials remain local

Technical Improvements (v4.7.5.90 MV3)

✅ Migrated from Manifest V2 to Manifest V3
✅ Replaced deprecated browserAction API with action
✅ Converted background page to service worker
✅ Added polyfills for legacy compatibility
✅ Introduced NoLegacy community branding

Installation Requirements Prerequisites

1Password Desktop App (v4.x or compatible standalone version)
Must be installed and properly configured
Local vault must be accessible
Valid 1Password License
A legitimate AgileBits license is required
Works with both standalone and subscription accounts
Firefox Browser
Version 109.0 or newer
Developer Edition or Nightly recommended for unsigned builds

Licensing

1Password software and trademarks are the property of AgileBits Inc.
This project serves purely as a compatibility bridge, not a crack or bypass.
A valid AgileBits license is required to use 1Password features.
The project fully respects all intellectual property rights.

Purpose This extension exists to:

✅ Preserve functionality of legitimately purchased software
✅ Maintain browser compatibility for older desktop versions
❌ Not to bypass licensing or enable unauthorized use

Disclaimer This is an unofficial community project:

Not affiliated with AgileBits or 1Password
Provided “as is,” without warranty or official support
Use at your own discretion and comply with AgileBits’ licensing terms