Highlight Word When Double Click is a free Chrome add-on developed by qii404. This add-on allows users to easily highlight words on a webpage by simply double-clicking on them. Once a word is selected, all other instances of the same word on the page will be automatically highlighted.

One of the main features of Highlight Word When Double Click is its ability to display the total number of matches for a selected word. This feature can be useful when searching for specific terms within a lengthy webpage. Additionally, the add-on supports highlighting words within iframes, making it versatile for various web environments.

Another useful feature is the right side preview, which functions similarly to the Ctrl+F right sidebar. This allows users to quickly preview the context of a highlighted word without losing their current position on the page.

Furthermore, users have the option to temporarily disable the highlight function by clicking on the extension icon. This can prevent any potential performance issues on larger pages.

Overall, Highlight Word When Double Click is a handy Chrome add-on that enhances the user's browsing experience by providing an easy and efficient way to highlight words on webpages.