Simply Synonyms is a thesaurus extension for Google Chrome. It helps you easily find synonyms, antonyms and more without getting in your way. To use, simply double click any word on any page or access quick search and other features from the extension popup.
@valeryfenskaya I'm sorry about the late reply; you should be able to double click any word on the page to find synonyms for it without opening a new tab. The search box was mostly designed for looking up synonyms for a word that isn't on the page, as opening the full thesaurus seemed more helpful in this situation. But if you think it would be more useful to have the search box work without leaving the extension, please let me know!
Dashly
Simply Synonyms