Synonyms.com
Get instant synonyms for any word or term that hits you anywhere on the web!
What is Synonyms.com?
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Summary
Synonyms.com is an online thesaurus reference resource that provides instant synonyms and antonyms definitions in several languages, along with visual diagrams of their associated semantic relationships.
To use this extension simply select a word on any web page you're visiting and click on the extension icon. A pop-up window will open with all possible synonyms and antonyms for the selected word.
Note: The extension will not work in tabs that were open prior to installation. After installing this extension, either reload your open tabs or restart Firefox.
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Risk impact
Synonyms.com may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Risk likelihood
Synonyms.com has earned a fairly good reputation and likely can be trusted.