Is Power Thesaurus safe?

Medium risk

Power Thesaurus sends the current site origin to its API and shares selected iframe text with embedding pages.

When a signed-in user browses, the extension's all-sites content script reports the current site's origin to Power Thesaurus at api.powerthesaurus.org/graphql/web. Its iframe selection bridge also posts selected text and selection geometry from iframes to the parent page using targetOrigin '*', so pages embedding that frame can read the selection message.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

Power Thesaurusv4.5.7Firefox Add-ons
42Risk
Who publishes it

Power Thesaurus - no other listings under this identity, 3 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
Power Thesaurus

Shared hosts - 3 hostnames

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.

api.powerthesaurus.org
Also called by 3 other listings, including Power Thesaurus
sentry.radyushin.com
Also called by 3 other listings, including Power Thesaurus
powerthesaurus.org
Also called by 6 other listings, including Power Thesaurus

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 4.5.7. 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 every site you visit

    <all_urls>

  • Run its own code inside the pages you visit

    scripting

  • Act on the current tab, but only after you click the extension

    activeTab

  • Write to your clipboard

    clipboardWrite

  • Add items to the right-click menu

    contextMenus

  • Store data in your browser

    storage

Where it sends data

Destinations our analysis observed Power Thesaurus contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • api.powerthesaurus.org

    Power Thesaurus sends data to api.powerthesaurus.org. No other extension we have analysed sends data here.

  • embedding page

    Power Thesaurus sends data to embedding page. Named as a recipient by 1 other extensions we have analysed.

Updated 30 September 2026amo-697681