Since comments are closed for now on the add-ons website, you can still post comment on my blog here ! Thanks :)

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Provides the option to copy selection as plain text or html.

It adds a "Copy As Html" and "Copy As Plain Text" to the context (right-click) menu. It is useful if you want to copy the text or underlying html from a web page into documents, posts or other applications.

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Check the original add-on for Firefox here