From Librarianchick
- Awesome Highlighter - Highlight text on web pages and get a small link to the highlighted page
- Diigo - Highlight, annotate, tag, collect, and remotely access web content
- Highlighter - This Firefox extension allows you to highlight text on a webpage
- MyStickies - Put sticky notes on Web pages
- Scrapbook - A Firefox extension, which helps you to save Web pages and highlight text
- Wired-Marker - A permanent indelible highlighter that you use on Web pages
- Wizlite - Highlight text on any page on the Internet and share it
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