Look up in Merriam-Webster Ⓡ v1.1
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The add-on enables you to select a given word/phrase and look it up in the Merriam Webster Ⓡ dictionary by opening www.merriam-webster.com in new tab displaying the word/phrase definition.
Usage:
1. Select a given word/phrase.
2. Right click on it and choose "Look up in Merriam-Webster Ⓡ" from the context menu.
This will open a new tab which loads "https://www.merriam-webster.com/dictionary/<the word you look up>" containing the definition of the word.