extenshi.io
SECURITY REPORT · EXTENSHI SCAN

CaptionSubtitleTool

Firefox extension·by Firefox user 15314155
96
/ 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

CaptionSubtitleTool's safety score vs every other extension we've scanned
Globally
95.69%of extensions carry more risk
This extension
Riskier ←→ Safer
Ranked across every extension we scan
In its category
85.69%of its category extensions carry more risk
This extension
Riskier ←→ Safer
Ranked within its category
Findings
4
median 38Lower is safer
Risky permissions
10
median 1Critical + high perms
Total permissions
14
median 4All declared perms
Critical findings
0
median 2Severity = Critical

Findings breakdown

Automated security signal · 4 distinct issues across 6 severities
4
distinct issues
detected

Permissions requested

10 risky permissions of 14 total
10 high-risk permissions require attention
This extension requests 14 permissions in total. 10 of them grant broad capabilities that are worth a careful look.
High
Execute scripts in pages

Can inject and execute JavaScript code in web pages

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

High
Filter service worker scripts

Can intercept and modify service worker scripts

High
Filter responses

Can filter and modify HTTP response bodies

High
Execute scripts in pages(optional)

Can inject and execute JavaScript code in web pages

Medium
Store local data

Can save data locally in the browser for persistence

Low
Schedule tasks

Can schedule periodic background tasks

Info
*://*/*

No additional information available.

Info
*://*.youtube.com/*

No additional information available.

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Scan performed by extenshi.io · Jul 25, 2026· partial run (some scanners failed)
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