Wiki seys: Google Chrome (commonly known simply as Chrome) is a freeware web browser developed by Google LLC. Chromium is an open-source Web browser project started by Google, to provide the source code for the proprietary Google Chrome browser. The two browsers share the majority of code and features, though there are some minor differences in features and logos, and they have different licensing.
Chrome Extensions are browser extensions that modify Google Chrome and Chromium browsers. These extensions are written using web technologies like HTML, JavaScript, and CSS. They are distributed through Chrome Web Store.
In the year 2012 I switched from using Opera browser to use new Chrome browser. With this change I needed to edit my older Opera extension FlerTop, to be able to use it in the new browser. Fortunately, Chrome extension API is very similar to the Opera one, so it took me only a day to port my extension.