Highlight Sync

Name: Highlight Sync
Author: fazorboy

Free, privacy-first web highlighter with sync and review and export in various formats (markdown, csv, obsidian, notion and more).

Download

Install

Features & Capabilities

Features

Feature	Description
Web Highlighting	Select text on any page → pick color → auto-save
Local-First Storage	All data in IndexedDB — no cloud required
Tags & Search	Tag highlights by topic, full-text search
Spaced Repetition	Daily review digest using SM-2 algorithm
Multi-Format Export	Markdown, CSV, JSON, Obsidian, Notion, Anki
Optional Sync	GitHub Gist (free) or self-hosted endpoint
Cross-Browser	Chrome + Firefox (Manifest V3)
Privacy-First	Zero analytics, zero tracking, fully open-source

Usage

Highlight text — Select text on any page → floating color toolbar appears → click a color
Keyboard shortcut — Ctrl+Shift+H (Windows/Linux) or Cmd+Shift+H (Mac) to highlight with default yellow
Right-click — Select text → right-click → "Highlight Selection" → pick color
Search — Click extension icon → Search tab → type to search across all highlights
Tags — Click extension icon → Tags tab → create and manage tags
Review — Click extension icon → Review tab → review highlights with spaced repetition
Export — Click extension icon → Export tab → choose format and download
Sync — Click extension icon → Settings tab → configure GitHub Gist or self-hosted sync

Export Formats

Format	Details
Markdown	Grouped by page/date/tag with metadata
Obsidian	Frontmatter YAML, `> [!quote]` callouts, `[[wikilinks]]`
Notion	Notion-compatible markdown with database properties
Anki	Tab-separated: front=context, back=highlight
CSV	Standard CSV with all fields
JSON	Raw JSON array for custom processing

Sync Options

Provider	How It Works
GitHub Gist	Stores highlights as JSON in a private gist (free, encrypted PAT)
Self-hosted	POST/GET to your REST endpoint (HTTPS required)
None	Fully local — zero network requests

User Growth & Download Statistics

Add-on

By:

fazorboy

Daily users:

Version:

1.0.0 Last updated: 2026-04-24

Version code:

6230078

Creation date:

2026-04-21

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

619.64KB

Email:

aj*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-16

Compare stats and ranking:

Ranking

# 149,856 ▲ 3,141

Other rankings

#245 in sync keyword 43 ▼ 7

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

fazorboy

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/highlight-sync/

Email:

aj*****@gmail.com

Website:

https://github.com/bhayanak/highlight-sync

Is Highlight Sync Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Highlight Sync requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Highlight Sync is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****