SECURITY REPORT · EXTENSHI SCAN
Tero - Save trees by browsing online
Firefox extension·by Tero
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
Tero - Save trees by browsing online's safety score vs every other extension we've scanned
Globally
70.47%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
60.47%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
20
median 38Lower is safer
Risky permissions
5
median 1Critical + high perms
Total permissions
7
median 4All declared perms
Critical findings
1
median 2Severity = Critical
Findings breakdown
Automated security signal · 20 distinct issues across 6 severities
20
distinct issues
detected
detected
Scanners reported 24 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical15%
High00%
Needs Review00%
Medium1470%
Low525%
Info00%
Permissions requested
5 risky permissions of 7 total
1 critical permission require attention
This extension requests 7 permissions in total. 5 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
Observe web requests
Can monitor all network requests made by the browser
High
Access browser cookies
Can read and modify cookies, potentially accessing login sessions
High
View most visited sites(optional)
Can see your most frequently visited websites
Medium
Access current tab
Can temporarily access the content of the active tab when you click the extension
Medium
Store local data
Can save data locally in the browser for persistence
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Scan performed by extenshi.io · Jul 25, 2026· partial run (some scanners failed)
Browser extensions made transparent.