Dictionary is a free and open-source browser add-on designed for the Chrome platform. Developed by Dan Mehr, this add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. With Dictionary, users can easily find the definition of any word on a web page using the convenient side panel feature.

One of the main features of Dictionary is its ability to search for words on highlight. By simply highlighting a word on a web page, users can open the side panel and instantly access the definition of that word. This makes it incredibly convenient for users who come across unfamiliar terms while browsing the internet.

In addition, Dictionary offers a popup mode that allows users to view word definitions in a popup window. This feature is available in English only, but it provides a quick and easy way to access word definitions without leaving the current webpage. Users can enable or disable the popup mode using the shortcut Alt + P, which can be customized in the Chrome extension settings.

Dictionary supports a wide range of languages, with a total of 162 languages available for word search and definition. This makes it a versatile tool for users who require word definitions in different languages.

Overall, Dictionary is a valuable browser add-on for those who frequently encounter unfamiliar words while browsing the internet. With its side panel search and popup mode features, it offers a convenient and efficient way to quickly find word definitions without interrupting the browsing experience.