Copy As Text от Francesco De Stefano

Copy contents, of web pages, as Plain Text with context menu
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Release 3.0
New Features
* Shows page plain text
* Text editing
* Download page plain text
* Removes all formatting from text
* Removes all advertising to focus only on the content of the text
* WebExtension only works on sites that allow content scripts.

The feature "Show page plain text" is based on this browser extension - https://github.com/deltavi/chrome-extension-plain-text