What Is a Browser Extension? - How-To Geek
https://www.howtogeek.com/718676/what-is-a-browser-extension/
WebMar 27, 2021 · The first extensions on Internet Explorer were called "Explorer Bars." They were simply specialized toolbars that could be added to the interface. For example, you could have an Explorer Bar that displayed a stock ticker. Mozilla's Firefox browser was the next to support extensions in 2004, followed by Opera in 2009, and finally, in 2010, by ...
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