Generally, a browser plug-in is a handy feature which is developed to make the users experience better. However, these elements are often referred to as add-ons or extensions, and many users choose to have a range of them installed on their browsers. Unluckily, some Google Chrome users have recently reported that while browsing they encounter â€˜Couldnâ€™t load plug-inâ€™ error. Here are some names of browser plugins which are quite common such as search engines, ad-blockers, online virus scanners, Java, Adobe Flash Player, and many others.