Firefox Add-ons

8Versions

0Code reviewed

Not reviewed

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26 indicators in this extension

26 indicators

0 versions analysed

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What our analysis found

Readwise Highlighter, used by 5,491 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites. It comes from a publisher with 6 extensions and was last updated in July 2026.

Readwise Highlighter Firefox extension security report

ID: readwise-highlighter

Extension Info & Metadata

Status

Active

Version

0.17.3

Size

2.74 MB

Rating

4.0/5

Reviews

Users

5,491

Type

Extension

Updated

Jul 27, 2026

Publisher Contextual Analysis

Author: Readwise
Privacy: Privacy Policy
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

19,576

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Screenshots & videos

Install growth

User Growth

Showing data from Sep 13, 2023 to Sep 12, 2024

Versions

-1.6%(-91 users)

Compared to 3 months ago

2 versions released in this period

See plans

React Flow

Internal permhash`c12d6948e6…`
No malicious matches

2 other extensions carry this fingerprint, none of them known malicious.

Withheldnot flagged
Withheldnot flagged

Permhash (Mandiant)`c12d6948e6…`
No malicious matches

1 other extension carries this fingerprint, none of them known malicious.

Withheldnot flagged

Network indicators

26 URLs and 0 IP literals were extracted from this version.

Item	Type	Severity	Description
<all_urls>	Host	Critical	Broad host access — the extension can read/modify content on every website.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 10% increase: Early script execution enables pre-emptive content manipulation• 15% increase: Older manifest version lacks modern security controls
Broad Host Permissions	Risk Factor	High	This extension has broad host permissions allowing it to access many or all websites.
Broad Content Script Access	Risk Factor	High	This extension can inject scripts into any website.
activeTab	Permission	Medium	This permission grants temporary access to the current tab. Rated Medium because it can access current page content when invoked, though limited to user-initiated actions.
background	Permission	Medium	This permission allows continuous background operation. Rated Medium because it can perform actions without user awareness, consume system resources, and maintain persistent connections.
storage	Permission	Medium	This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
tabs	Permission	Medium	This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
unlimitedStorage	Permission	Medium	This permission removes storage quota restrictions. Rated Medium because it can store large amounts of user data without limits, potentially impacting browser performance and storing extensive tracking data.
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
Older Manifest Version	Risk Factor	Medium	This extension uses Manifest Version 2
contextMenus	Permission	Low	This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.
notifications	Permission	Low	This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.

26 indicators in this extension

26 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

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About this extension

The Readwise Highlighter is the official browser extension made by and maintained by the Readwise team that saves articles to your Reader account and enables you to optionally highlight the open web.

User reviews

3.8 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

Recently, maybe after the update of 2026-08-25, when I open openrouter.ai site, an error occurred: Application error: a client-side exception has occurred (see the browser console for more information).

andersc·29 Aug 2026

It works fine, but requires some performance overhaul. It slows down overall tab loading significantly... so I have needed to disable it.

Firefox user 17582509·17 May 2026

The tracking is just horrible... why not just let me pay and stop all the tracking? Other than that it's a good service.

Extension files

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URLs

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No URLs found

No IP addresses found

26 indicators in this extension

26 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

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Version	Size	Verdict	Findings	Permhash
0.15.22 Latest	2.75 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.15.23	2.75 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.15.24	2.75 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.15.25	2.75 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.17.0	2.75 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.17.1	2.74 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.17.2	2.74 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c
0.17.3	2.74 MB	Not scanned	—	c12d6948e6d599464b65e1887c22527b7c975a2888c35a9040087bbb866cb60c

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Code Diff

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0 changed files detected

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Not reviewed

26 indicators in this extension

What our analysis found