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for example - I want to do a spellcheck on a portion of text already there on a webpage, not necessarily in a textbox.

Is it possible through some add-on (Firefox or Chrome) or script?

For example,

thsi quot has speling erorrs, but you would see them underlined only when you try to edit. Once it is displayed as non editable webpage element, the spell check does not run.

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Use following extensions/scripts

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Further has an online spell checker.

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