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Better Yet Rated 5 out of 5 stars
I don't know how you missed it, but when you right-click "Remove everything else" is directly above "Remove selection" on the menu, not to mention that it is mentioned in the very first paragraph "More about this add-on."
The first paragraph, in pertinent part, states, "You can also make a selection and chose "Remove everything else" to clear the page and only leave the selected text.."