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Extensions 
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Copy As Plain Text
Easily copy the selected text without formatting to the clipboard via the right-click menu.
Copy Text Easily
A simple and hassle free way to copy text, paragraphs, sentences and custom selections in browser.
Copy as Plain Text
Extension to copy selected text as plain text. Also option to Append as plain text. Keeps carriage returns and line feeds.
Copy text without spaces - amaz.in/g
Copy quick and easy the selected text without spaces and formatting to the clipboard.
Copy Plain Text
Allows to copy plain text to clipboard with context menu. Has 3 different copy methods. Has 'force plain text copy' option.
Copy URL with Title (plain text/markdown)
Copy the title and URL in plain text/markdown format by 'key'board shortcuts: Ctrl+C/Cmd+C for plain text, Alt+C/Opt+C for markdown.