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Make sure that the Bookmarks Toolbar is visible. (Click on the "View" menu item and select "Toolbars" ->
"Bookmarks Toolbar" if it is not visible.
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Drag this Merriam-Webster Dictionary link onto the Bookmarks Toolbar. A dictionary button should appear on
the Bookmarks Toolbar with a bookmark icon. (As you drag the link, you will see a circle with a line through
it until you reach the toolbar.)
You can now view the definition of a word by highlighting it and clicking on the Merriam-Webster Lookup Button
in the Firefox bookmarks toolbar. If double-clicking does not work, try swiping the word to highlight it. If you
click on the button without selecting a word, a dialog box will prompt you to select a word.
The Lookup Button may not operate properly when used with pages that include frames or other dynamic features.