SECURITY REPORT · EXTENSHI SCAN
Use the USPS postage calculator w/o its Javascript
Firefox extension·by NateN1222
0
/ 100 SAFETY SCORE
EXCELLENT
Looks clean. No meaningful risks detected in this scan.
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
Use the USPS postage calculator w/o its Javascript's safety score vs every other extension we've scanned
Globally
97.17%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
87.17%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
1
median 38Lower is safer
Risky permissions
2
median 1Critical + high perms
Total permissions
4
median 4All declared perms
Critical findings
0
median 2Severity = Critical
Findings breakdown
Automated security signal · 1 finding across 5 severities
1
findings
detected
detected
Critical00%
High00%
Medium1100%
Low00%
Info00%
Permissions requested
2 risky permissions of 4 total
2 high-risk permissions require attention
This extension requests 4 permissions in total. 2 of them grant broad capabilities that are worth a careful look.
High
Observe web requests
Can monitor all network requests made by the browser
High
Block and modify web requests
Can intercept, block, or modify any network request before it completes
Info
https://postcalc.usps.com/*
No additional information available.
Info
*://www.postcalc.usps.com/*
No additional information available.
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Scan performed by extenshi.io · Jun 25, 2026· partial run (some scanners failed)
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