SECURITY REPORT · EXTENSHI SCAN
onHover — Developer Toolkit
Firefox extension·by onHover
0
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.
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
onHover — Developer Toolkit's safety score vs every other extension we've scanned
Globally
2%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Productivity
2%of productivity extensions carry more risk
Riskier ←→ Safer
Ranked against 177,133 productivity extensions
Findings
481
median 16Lower is safer
Critical findings
2
median 0Severity = Critical
Permissions
13
median 3Declared in manifest
Active users
1
median 14vs category median
Findings breakdown
Automated security signal · 481 distinct issues across 6 severities
481
distinct issues
detected
detected
Scanners reported 546 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical20%
High9720%
Needs Review10%
Medium37277%
Low41%
Info51%
Permissions requested
8 risky permissions of 13 total
2 critical permissions require attention
This extension requests 13 permissions in total. 8 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites
Can read and modify content on every website you visit
Critical
Browser debugger access
Can attach to tabs and inspect/modify all page data using Chrome DevTools protocol
High
View open tabs
Can see URLs and titles of all open tabs
High
Execute scripts in pages
Can inject and execute JavaScript code in web pages
High
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
High
Delete browsing data
Can remove browsing history, cookies, cache, and other browsing data
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Medium
Write to clipboard
Can place content onto your clipboard
Low
Create offscreen documents
Can create hidden documents for background processing tasks
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Scan performed by extenshi.io · Aug 16, 2026
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