One of the features I wish were built into web browsers is highlight all. That is, if I double-click a word or highlight some text in a webpage, I want the browser to highlight all instances of this on the webpage. The Highlight All extension does this for Chrome.
By default, you need to manually select the text, right-click and choose Highlight All. I prefer that a double-click on a word or any selection to be automatically highlighted on the webpage. To do this, click on the icon of Highlight All in the toolbar and choose Auto Highlight Selection.
Tried with: Highlight All 0.37, Chrome 27.0.1453.93 and Ubuntu 12.04 LTS