Lyncor Guard by Lmncry
Local-first Firefox privacy, performance and site tools with no telemetry or account. Includes YouTube tools, SponsorBlock API integration, Media Save and optional site automation.
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Extension Metadata
About this extension
Lyncor Guard is a local-first Firefox extension focused on privacy, performance, convenience and lightweight site automation.
The extension is designed to keep unnecessary background activity to a minimum. Features are enabled only when needed, and settings and statistics are stored locally in Firefox.
Main features:
• Privacy and security tools
Cookie consent handling, tracking URL cleanup, embed protection, WebRTC and referrer controls, IDN/Punycode protection, download safety, clipboard protection and other optional browser hardening tools.
• Performance tools
Smart tab management, reduced background media activity, animation control and network optimizations designed to reduce unnecessary resource usage.
• YouTube Toolkit
Optional YouTube enhancements including autoplay control, theater mode, Shorts controls, playback speed preferences and timeline integration.
• SponsorBlock API integration
Lyncor Guard can use the public SponsorBlock API and community-provided segment data to identify and skip selected segments in YouTube videos.
SponsorBlock is an independent open-source project. Lyncor Guard is not an official SponsorBlock client and is not affiliated with the SponsorBlock project.
• Media Save
Finds supported video and audio media on the current page only when requested by the user. Media Save does not continuously scan pages in the background.
• HoYoLAB tools
Optional HoYoLAB Daily Check-In automation and a Genshin Impact Resin Monitor for displaying current Original Resin information.
• Site automation
Optional tools for supported websites, including Twitch Channel Points collection and FunPay offer auto-raise while the relevant website is open.
• Per-site controls
Disable Lyncor Guard completely on selected websites or create individual site profiles with custom settings.
• Presets
Quickly switch between predefined protection levels or create a custom configuration.
Privacy:
Lyncor Guard has no user account and no Lyncor Guard telemetry service. Extension settings, counters and preferences are stored locally in Firefox.
Some optional features communicate directly with the third-party services they are designed to work with, such as SponsorBlock or HoYoLAB. These integrations can be disabled by the user.
Lyncor Guard is built specifically for Firefox.
The extension is designed to keep unnecessary background activity to a minimum. Features are enabled only when needed, and settings and statistics are stored locally in Firefox.
Main features:
• Privacy and security tools
Cookie consent handling, tracking URL cleanup, embed protection, WebRTC and referrer controls, IDN/Punycode protection, download safety, clipboard protection and other optional browser hardening tools.
• Performance tools
Smart tab management, reduced background media activity, animation control and network optimizations designed to reduce unnecessary resource usage.
• YouTube Toolkit
Optional YouTube enhancements including autoplay control, theater mode, Shorts controls, playback speed preferences and timeline integration.
• SponsorBlock API integration
Lyncor Guard can use the public SponsorBlock API and community-provided segment data to identify and skip selected segments in YouTube videos.
SponsorBlock is an independent open-source project. Lyncor Guard is not an official SponsorBlock client and is not affiliated with the SponsorBlock project.
• Media Save
Finds supported video and audio media on the current page only when requested by the user. Media Save does not continuously scan pages in the background.
• HoYoLAB tools
Optional HoYoLAB Daily Check-In automation and a Genshin Impact Resin Monitor for displaying current Original Resin information.
• Site automation
Optional tools for supported websites, including Twitch Channel Points collection and FunPay offer auto-raise while the relevant website is open.
• Per-site controls
Disable Lyncor Guard completely on selected websites or create individual site profiles with custom settings.
• Presets
Quickly switch between predefined protection levels or create a custom configuration.
Privacy:
Lyncor Guard has no user account and no Lyncor Guard telemetry service. Extension settings, counters and preferences are stored locally in Firefox.
Some optional features communicate directly with the third-party services they are designed to work with, such as SponsorBlock or HoYoLAB. These integrations can be disabled by the user.
Lyncor Guard is built specifically for Firefox.
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Permissions and data
Required permissions:
- Read and modify browser settings
- Block content on any page
- Monitor extension usage and manage themes
- Display notifications to you
- Read and modify privacy settings
- Access browser tabs
- Access browser activity during navigation
Optional permissions:
- Clear recent browsing history, cookies, and related data
- Download files and read and modify the browser’s download history
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
Optional data collection, according to the developer:
- Authentication information
- Browsing activity
More information
- Add-on Links
- Version
- 1.0.1
- Size
- 455.59 KB
- Last updated
- 7 days ago (Nov 5, 2026)
- Related Categories
- License
- Mozilla Public License 2.0
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection