SECURITY REPORT · EXTENSHI SCAN
Legacy Browser Support
Firefox extension·by Mike Kaply
0
/ 100 SAFETY SCORE
RISKY
Several elevated signals. Read the findings before sharing this with your team.
Likely abandonedsafety score reduced by 30 points
- No update in over 6 years
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
Legacy Browser Support's safety score vs every other extension we've scanned
Globally
16%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Other
5%of other extensions carry more risk
Riskier ←→ Safer
Ranked against 26,888 other extensions
Findings
22
median 3Lower is safer
Critical findings
3
median 0Severity = Critical
Permissions
7
median 3Declared in manifest
Active users
4047
median 2vs category median
Findings breakdown
Automated security signal · 22 distinct issues across 6 severities
22
distinct issues
detected
detected
Critical314%
High627%
Needs Review00%
Medium1150%
Low29%
Info00%
Permissions requested
6 risky permissions of 7 total
1 critical permission require attention
This extension requests 7 permissions in total. 6 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
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
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 · Aug 15, 2026
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