SECURITY REPORT · EXTENSHI SCAN
Serene: Website Blocker & Productivity Timer
Firefox extension·by SereneApp.com
0
/ 100 SAFETY SCORE
DANGEROUS
Meaningful risk surface. Avoid on managed devices without review.
Likely abandonedsafety score reduced by 30 points
- No update in over 6 years
- Built on Manifest V2, which Chrome and Edge are retiring
Why this matters
An unmaintained extension keeps whatever flaws it shipped with, and a listing with users but no owner is an attractive target to buy and repurpose.
Automated analysis of publicly available code — not a professional security audit. It may produce false positives and does not prove an extension is unsafe or safe. Treat it as one signal among many. Disclaimer · Report an issue
How it ranks
Serene: Website Blocker & Productivity Timer's safety score vs every other extension we've scanned
Globally
8%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Productivity
19%of productivity extensions carry more risk
Riskier ←→ Safer
Ranked against 6,496 productivity extensions
Findings
19
median 17Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
5
median 3Declared in manifest
Active users
27
median 140vs category median
Findings breakdown
Automated security signal · 19 distinct issues across 6 severities
19
distinct issues
detected
detected
Scanners reported 26 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical316%
High316%
Needs Review00%
Medium842%
Low526%
Info00%
Permissions requested
4 risky permissions of 5 total
1 critical permission require attention
This extension requests 5 permissions in total. 4 of them grant broad capabilities that are worth a careful look.
Critical
Communicate with desktop apps
Can exchange messages with applications installed on your computer
High
View open tabs
Can see URLs and titles of all open tabs
High
Access all HTTP sites
Can read and modify content on all non-encrypted websites
High
Access all HTTPS sites
Can read and modify content on all encrypted websites
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Jul 25, 2026
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