SECURITY REPORT · EXTENSHI SCAN
FlashBlock — Spaced Repetition
Firefox extension·by Web Inventions
0
/ 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
FlashBlock — Spaced Repetition's safety score vs every other extension we've scanned
Globally
23%of extensions carry more risk
Riskier ←→ Safer
Ranked against 369,936 extensions
In Other
7%of other extensions carry more risk
Riskier ←→ Safer
Ranked against 26,888 other extensions
Findings
33
median 3Lower is safer
Critical findings
1
median 0Severity = Critical
Permissions
5
median 3Declared in manifest
Active users
1
median 2vs category median
Findings breakdown
Automated security signal · 33 distinct issues across 6 severities
33
distinct issues
detected
detected
Critical13%
High13%
Needs Review00%
Medium2988%
Low26%
Info00%
Permissions requested
3 risky permissions of 5 total
1 critical permission require attention
This extension requests 5 permissions in total. 3 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
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
Medium
Unlimited local storage
Can store large amounts of data locally without size limits
Low
Schedule tasks
Can schedule periodic background tasks
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Scan performed by extenshi.io · Aug 7, 2026
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