Is SimpleLogin: Open-source Email Protection safe?
SimpleLogin exposes an unguarded postMessage handler on every page, letting any site script force navigation to the SimpleLogin dashboard.
The extension injects a content script into every HTTP and HTTPS page. This script listens for postMessage events without checking the sender's origin, allowing any page script to query whether the extension is installed and, if the user is logged in, force a redirect to app.simplelogin.io/dashboard/. A separate handler broadcasts the extension's version back to any requesting page script.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
Who publishes itSimpleLogin & Proton Pass team - no other listings under this identity, 1 shared hostname
SimpleLogin & Proton Pass team - no other listings under this identity, 1 shared hostname
What this publisher told the store about itself, and the other listings that told it the same thing.
Shared hosts - 1 hostname
Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.
AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.
Publishers can request a review.
What it can do
Permissions this extension asks for, as declared in version 3.0.7. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.
Read and change your data on simplelogin.io
https://*.simplelogin.io/*
Read and change your data on every site you visit
http://*/*
Read and change your data on every secure site you visit
https://*/*
Act on the current tab, but only after you click the extension
activeTab
Store data in your browser
storage
Add items to the right-click menu
contextMenus
Run its own code inside the pages you visit
scripting
See the address and title of every tab you have open
tabs