Is WordWeb Dictionary Lookup safe?

Look up selected words in WordWeb from web pages and text fields.

This extension adds shortcuts for opening WordWeb with selected text, a word under the cursor, or a word you Ctrl+right-click on a page. When editing text, it can use WordWeb’s Replace button to replace a word with a synonym or corrected spelling. It requires WordWeb or WordWeb Pro 8.1 or higher for Windows to be installed separately.