SECURITY REPORT · EXTENSHI SCAN
WebSerial for Firefox
Firefox extension·by kuba2k2
71
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
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
WebSerial for Firefox's safety score vs every other extension we've scanned
Globally
8%of extensions carry more risk
Riskier ←→ Safer
Ranked against 415,874 extensions
In Other
5%of other extensions carry more risk
Riskier ←→ Safer
Ranked against 28,829 other extensions
Findings
33
median 6Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
3
median 3Declared in manifest
Active users
3102
median 2vs category median
Findings breakdown
Automated security signal · 33 distinct issues across 6 severities
33
distinct issues
detected
detected
Scanners reported 34 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical39%
High412%
Needs Review00%
Medium2164%
Low39%
Info26%
Permissions requested
1 risky permission of 3 total
1 critical permission require attention
This extension requests 3 permissions in total. 1 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
Medium
Store local data
Can save data locally in the browser for persistence
Info
*://*/*
No additional information available.
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Scan performed by extenshi.io · Oct 22, 2026
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