Wordstore by Christofosho

→ Store unlimited lines of text which can be quickly copied.
→ Highlight and right-click text on a webpage, revealing a new context-menu option to store the highlighted text
→ Remove items you no longer require on the list.
→ Search your list for items containing, starting with, or ending with a given set of characters or words.
→ Quickly access your words through your browser.

Disclaimer: This tool does not store its contents in any encrypted manner, and as such is not a good choice to store sensitive information such as passwords or financial information.